Add backend structure with Docker support and initial configuration files

Signed-off-by: Dmitrii <computer@yawaflua.tech>

Took 4 hours 25 minutes

backend/SpMega.Backend/Authetication/JwtAuthHandler.cs

@@ -0,0 +1,64 @@
+using System.Security.Claims;
+using System.Text.Encodings.Web;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using SpMega.Backend.Persistent.Database;
+
+namespace SpMega.Backend.Authetication;
+
+public class JwtAuthHandler(
+    IOptionsMonitor<JwtAuthenticationSchemeOptions> options,
+    ILoggerFactory logger,
+    UrlEncoder encoder,
+    AppDbContext dbContext) : AuthenticationHandler<JwtAuthenticationSchemeOptions>(options, logger, encoder)
+{
+
+    protected override async Task<AuthenticateResult> HandleAuthenticateAsync()
+    {
+        if (!Request.Headers.ContainsKey("Authorization") || !Request.Headers.Authorization.ToString().StartsWith("Bearer "))
+            return AuthenticateResult.NoResult();
+
+        var token = Request.Headers.Authorization.ToString().Replace("Bearer ", "");
+
+        if (string.IsNullOrEmpty(token))
+        {
+            return AuthenticateResult.Fail("Invalid authorization header format");
+        }
+
+        try
+        {
+            var user = await dbContext.Users.FirstOrDefaultAsync(k => k.Token == token);
+
+            if (user == null)
+            {
+                return AuthenticateResult.Fail("Invalid or expired token");
+            }
+
+            var claims = new List<Claim>
+            {
+                new(ClaimTypes.NameIdentifier, user.Id.ToString()),
+                new(ClaimTypes.Name, user.Username),
+                new("UserId", user.Id.ToString()),
+                new("Token", token),
+                new(ClaimTypes.Role, "default")
+            };
+
+            var claimsIdentity = new ClaimsIdentity(claims, Scheme.Name);
+            var claimsPrincipal = new ClaimsPrincipal(claimsIdentity);
+
+            Context.Items["User"] = user;
+            Context.Items["@me"] = user;
+            Context.Items["user"] = user;
+
+            var ticket = new AuthenticationTicket(claimsPrincipal, Scheme.Name);
+
+            return AuthenticateResult.Success(ticket);
+        }
+        catch (Exception ex)
+        {
+            Logger.LogError(ex, "Error during JWT authentication");
+            return AuthenticateResult.Fail("Authentication error occurred");
+        }
+    }
+}

backend/SpMega.Backend/Authetication/JwtAuthenticationSchemeOptions.cs

@@ -0,0 +1,8 @@
+using Microsoft.AspNetCore.Authentication;
+
+namespace SpMega.Backend.Authetication;
+
+public class JwtAuthenticationSchemeOptions : AuthenticationSchemeOptions
+{
+    public const string DefaultScheme = "JwtScheme";
+}

backend/SpMega.Backend/Controllers/v1/AuthController.cs

@@ -0,0 +1,205 @@
+using System.Net;
+using System.Net.Http.Headers;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using MongoDB.Driver;
+using SpMega.Backend.Persistent.Database;
+using SpMega.Backend.Persistent.Models.DTO;
+using SpMega.Backend.Persistent.Models.Users;
+using SpMega.Backend.Services;
+using SPWorldsApi;
+using SPWorldsApi.Types.Interfaces;
+
+namespace SpMega.Backend.Controllers.v1;
+
+
+public record GetSessionIdBody(string userName, Guid userUUID);
+public record ValidateSessionBody(string sessionId, Guid userUUID);
+[Route("api/v1/auth")]
+[ApiController]
+public class AuthController(AppDbContext dbContext, TokenService tokenService, ILogger<AuthController> logger) : ControllerBase
+{
+    private const string BASE_URL = "https://spworlds.ru/api/public";
+    public AuthenticationHeaderValue? AuthHeader { get; set; }
+
+    [HttpPost("start")]
+    public async Task<IActionResult> GetSessionIdAsync([FromBody] GetSessionIdBody body)
+    {
+        var userSession = new UserSession
+        {
+            Id = Guid.NewGuid(),
+            Token = Program.GenerateRandomString(15),
+            UserId = body.userUUID,
+            UserName = body.userName,
+            CreatedAt = DateTime.UtcNow
+        };
+        await dbContext.UserSessions.AddAsync(userSession);
+        await dbContext.SaveChangesAsync();
+        
+        
+        return Ok(new { sessionId = userSession.Token});
+    }
+    
+    [HttpPost("validate")]
+    public async Task<ActionResult<User>> ValidateSessionAsync([FromBody]ValidateSessionBody body)
+    {
+        try
+        {
+            var session =
+                await dbContext.UserSessions.FirstOrDefaultAsync(k => k.UserId == body.userUUID && k.Token == body.sessionId);
+            if (session == null || session.CreatedAt.AddMinutes(2) < DateTime.UtcNow || session.IsDeleted)
+                throw new Exception("Session expired or not fount");
+
+            using var httpClient = new HttpClient();
+            using var request = new HttpRequestMessage(
+                HttpMethod.Get,
+                $"https://sessionserver.mojang.com/session/minecraft/hasJoined?username={session.UserName}&serverId={session.Token}"
+            );
+            session.IsDeleted = true;
+            session.DeletedAt = DateTime.UtcNow;
+            session.UpdatedAt = DateTime.UtcNow;
+            await dbContext.SaveChangesAsync();
+
+            var resp = await httpClient.SendAsync(request);
+            if (resp.StatusCode != HttpStatusCode.OK) throw new Exception("Mojang response is not OK");
+            Console.WriteLine(await resp.Content.ReadAsStringAsync());
+            var dto = await resp.Content.ReadFromJsonAsync<MojangDto>();
+            if (dto == null || dto.Name != session.UserName || Guid.Parse(dto.Id) != session.UserId) throw new Exception("Session expired, or dto is not acceptable.");
+            var token = tokenService.GenerateAccessToken(session.UserName, body.userUUID);
+            var user = await dbContext.Users.FirstOrDefaultAsync(k => k.Id == session.UserId);
+            if (user != null)
+            {
+                user.Token = token;
+                dbContext.Update(user);
+            }
+            else
+            {
+                user = new User
+                {
+                    Id = body.userUUID,
+                    Username = session.UserName,
+                    Token = token,
+                };
+                await dbContext.AddAsync(user);
+            }
+
+            await dbContext.SaveChangesAsync();
+            
+            return Ok(user);
+        }
+        catch (Exception e)
+        {
+            logger.LogError(e, "Error when validation session.");
+            return BadRequest("I think ure try to fool us. Try again later");
+        }
+
+    }
+
+    [HttpPut("cards")]
+    [Authorize]
+    public async Task<IActionResult> AddCardAsync([FromBody] AddCardBody body)
+    {
+        try
+        {
+            var BearerToken = $"{body.id}:{body.token}";
+            string Base64BearerToken = Convert.ToBase64String(Encoding.UTF8.GetBytes(BearerToken));
+            var resp = await SendRequest("/accounts/me", new("Bearer", Base64BearerToken));
+            var me = JsonSerializer.Deserialize<UserAccountDTO>(resp);
+            Console.WriteLine(resp);
+            var user = ((User)HttpContext.Items["@me"]);
+            Console.WriteLine(me.id);
+            Console.WriteLine(user.Id.ToString());
+            if (user == null || user.Id.ToString() != me.minecraftUUID)
+            {
+                throw new Exception("Its not ur card");
+            }
+
+            var card = me.cards.First(k => k.id == body.id);
+            var existingCard = user.Cards.FirstOrDefault(k => k.Id.ToString() == card.id);
+            if (existingCard == null)
+                user.Cards.Add(new Card
+                {
+                    Id =  Guid.Parse(card.id),
+                    Name = card.name,
+                    SpworldsID = card.number,
+                    Token = Base64BearerToken,
+                    CreatedAt = DateTime.UtcNow,
+                });
+            else
+            {
+
+                existingCard.Name = card.name;
+                existingCard.SpworldsID = card.number;
+                existingCard.Token = Base64BearerToken;
+                existingCard.UpdatedAt = DateTime.UtcNow;
+                
+            }
+            await dbContext.SaveChangesAsync();
+            return Ok();
+        }
+        catch (Exception e)
+        {
+            logger.LogError(e, "Error when adding card.");
+            return BadRequest("Error when adding card.");
+        }
+    }
+
+    
+
+    [HttpGet("cards")]
+    [Authorize]
+    public async Task<ActionResult<List<Card>>> GetAllCardsAsync()
+    {
+        return Ok(((User)HttpContext.Items["@me"]).Cards.Where(k => !k.IsDeleted).ToList());
+    }
+
+    [HttpDelete("cards/{id}")]
+    [Authorize]
+    public async Task<IActionResult> DeleteCardAsync(Guid id)
+    {
+        try
+        {
+            var user = (HttpContext.Items["@me"] as User);
+            user.Cards.RemoveAll(c => c.Id == id);
+            await dbContext.SaveChangesAsync();
+            return Ok();
+        }
+        catch (Exception e)
+        {
+            logger.LogError(e, "Error when deleting card.");
+            return BadRequest("Error when deleting card.");
+        }
+    }
+    
+    internal async Task<string> SendRequest(string endpoint, AuthenticationHeaderValue AuthHeader, HttpMethod method = null, object body = null)
+    {
+        method ??= body == null ? HttpMethod.Get : HttpMethod.Post;
+
+        HttpResponseMessage message;
+        var client = new System.Net.Http.HttpClient();
+
+        using (var requestMessage = new HttpRequestMessage(method, BASE_URL + endpoint))
+        {
+            requestMessage.Content = new StringContent(
+                JsonSerializer.Serialize(body),
+                Encoding.UTF8, "application/json"
+            );
+
+            requestMessage.Headers.Authorization = AuthHeader;
+
+            message = await client.SendAsync(requestMessage);
+
+        }
+
+        client.Dispose();
+
+        return await message.Content.ReadAsStringAsync();
+    }
+}
+
+public record AddCardBody(string id, string token);
+

backend/SpMega.Backend/Controllers/v1/TransactionsController.cs

@@ -0,0 +1,132 @@
+using System.Net.Http.Headers;
+using System.Text;
+using System.Text.Json;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using SpMega.Backend.Persistent.Database;
+using SpMega.Backend.Persistent.Models.Transactions;
+using SpMega.Backend.Persistent.Models.Users;
+using SPWorldsApi;
+
+namespace SpMega.Backend.Controllers.v1;
+
+[Route("api/v1/transactions")]
+[ApiController]
+public class TransactionsController(AppDbContext context, ILogger<TransactionsController> logger, IConfiguration config) : ControllerBase
+{
+   private const string BASE_URL = "https://spworlds.ru/api/public";
+
+   [HttpGet("{billId}")]
+   public async Task<IActionResult> GetBill(string billId)
+   {
+      var transaction = await context.Transactions
+         .FirstOrDefaultAsync(t => t.ShortId == billId);
+
+      if (transaction == null)
+      {
+         if (billId == "00000000")
+         {
+            return Ok(new Transaction
+            {
+               Id = Guid.Empty,
+               ShortId = "00000000",
+               ReceiverName = "yawaflua",
+               ReceiverCardNumber = "00000",
+               Sender = new User
+               {
+                  Id = default,
+                  Username = "yawaflua",
+                  Token = "123",
+               },
+               SenderCardNumber = "010101",
+               Amount = 42,
+               Comment = "API FIRST",
+               TransactionDate = DateTime.UtcNow
+            });
+         }
+         return NotFound(new { error = "Transaction not found" });
+      }
+
+      return Ok(transaction);
+   }
+
+   [HttpPut()]
+   [Authorize]
+   public async Task<ActionResult<Transaction>> CreateTransaction([FromBody] CreateTransactionBody body)
+   {
+      var BearerToken = $"{body.cardToUse.Id}:{body.cardToUse.Token}";
+      string Base64BearerToken = Convert.ToBase64String(Encoding.UTF8.GetBytes(BearerToken));
+
+      
+      var shortId = Program.GenerateRandomString(8);
+      var transaction = new Transaction
+      {
+         ReceiverName = body.receiverName,
+         ShortId = shortId,
+         ReceiverCardNumber = body.receiverCard,
+         Sender = HttpContext.Items["@me"] as User,
+         SenderCardNumber = body.cardToUse.SpworldsID,
+         Amount = body.amount,
+         Comment = body.comment,
+      };
+      try
+      {
+         var uri = new Uri(new Uri(config["Url"] ?? "https://spmega.yawaflua.tech"), "/" + shortId);
+         var transitionInfo = new Dictionary<string, object>
+         {
+            { "receiver", body.receiverCard },
+            { "amount", body.amount },
+            { "comment", "Чек: "+ uri }
+         };
+
+         await SendRequest(endpoint: "transactions", body: transitionInfo, AuthHeader:new("Bearer", Base64BearerToken));
+
+      } catch (Exception exception)
+      {
+         logger.LogError(exception, "Error creating transaction");
+         return BadRequest(new { error = "Failed to create transaction" });
+      }
+      await context.AddAsync(transaction);
+      await context.SaveChangesAsync();
+
+      return Ok(new Transaction
+      {
+         Id = transaction.Id,
+         ReceiverName = transaction.ReceiverName,
+      });
+   }
+
+   [HttpGet()]
+   [Authorize]
+   public async Task<ActionResult<List<Transaction>>> GetAllTransactions()
+   {
+      return Ok(await context.Transactions.Where(k => k.Sender.Id == ((User)HttpContext.Items["@me"]).Id).ToListAsync());
+   }
+   
+   internal async Task<string> SendRequest(string endpoint, AuthenticationHeaderValue AuthHeader, HttpMethod method = null, object body = null)
+   {
+      method ??= body == null ? HttpMethod.Get : HttpMethod.Post;
+
+      HttpResponseMessage message;
+      var client = new System.Net.Http.HttpClient();
+
+      using (var requestMessage = new HttpRequestMessage(method, BASE_URL + endpoint))
+      {
+         requestMessage.Content = new StringContent(
+            JsonSerializer.Serialize(body),
+            Encoding.UTF8, "application/json"
+         );
+
+         requestMessage.Headers.Authorization = AuthHeader;
+
+         message = await client.SendAsync(requestMessage);
+
+      }
+
+      client.Dispose();
+
+      return await message.Content.ReadAsStringAsync();
+   }
+}
+public record CreateTransactionBody(Card cardToUse, string receiverCard, string receiverName, string comment, int amount);

backend/SpMega.Backend/Dockerfile

@@ -2,7 +2,6 @@
 USER $APP_UID
 WORKDIR /app
 EXPOSE 8080
-EXPOSE 8081
 
 FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
 ARG BUILD_CONFIGURATION=Release

backend/SpMega.Backend/Pages/v1/AgreementPage.cshtml

@@ -0,0 +1,573 @@
+@page "/privacy"
+@model SpMega.Backend.AgreementPage
+
+@{
+    Layout = null;
+}
+
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Пользовательское соглашение — SPMega</title>
+    
+    <!-- Google Fonts -->
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
+
+    <style>
+        :root {
+            --bg-color: #0b0f17;
+            --surface-color: #121824;
+            --surface-border: rgba(255, 255, 255, 0.08);
+            --primary: #3b82f6;
+            --primary-glow: rgba(59, 130, 246, 0.15);
+            --success: #10b981;
+            --success-glow: rgba(16, 185, 129, 0.15);
+            --warning: #f59e0b;
+            --warning-glow: rgba(245, 158, 11, 0.1);
+            --text-main: #f3f4f6;
+            --text-muted: #9ca3af;
+            --text-link: #60a5fa;
+            --font-sans: 'Inter', sans-serif;
+            --font-display: 'Outfit', sans-serif;
+            --font-mono: 'JetBrains Mono', monospace;
+        }
+
+        * {
+            box-sizing: border-box;
+            margin: 0;
+            padding: 0;
+            scroll-behavior: smooth;
+        }
+
+        body {
+            font-family: var(--font-sans);
+            background-color: var(--bg-color);
+            color: var(--text-main);
+            min-height: 100vh;
+            line-height: 1.6;
+            overflow-x: hidden;
+            display: flex;
+            flex-direction: column;
+            position: relative;
+        }
+
+        /* Subtle glowing background blobs */
+        .glow-blob {
+            position: absolute;
+            border-radius: 50%;
+            filter: blur(120px);
+            z-index: 0;
+            pointer-events: none;
+            opacity: 0.5;
+        }
+
+        .blob-1 {
+            width: 400px;
+            height: 400px;
+            background: rgba(59, 130, 246, 0.12);
+            top: -100px;
+            left: -100px;
+        }
+
+        .blob-2 {
+            width: 500px;
+            height: 500px;
+            background: rgba(16, 185, 129, 0.08);
+            bottom: -150px;
+            right: -100px;
+        }
+
+        .wrapper {
+            position: relative;
+            z-index: 1;
+            max-width: 1200px;
+            width: 100%;
+            margin: 0 auto;
+            padding: 40px 24px 80px;
+            flex-grow: 1;
+        }
+
+        /* Navigation Header */
+        header {
+            margin-bottom: 40px;
+            border-bottom: 1px solid var(--surface-border);
+            padding-bottom: 24px;
+            display: flex;
+            justify-content: space-between;
+            align-items: center;
+        }
+
+        .logo-group {
+            display: flex;
+            align-items: center;
+            gap: 12px;
+            text-decoration: none;
+        }
+
+        .logo-icon {
+            width: 36px;
+            height: 36px;
+            background: linear-gradient(135deg, var(--primary), var(--success));
+            border-radius: 8px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            font-weight: 800;
+            font-family: var(--font-display);
+            color: #ffffff;
+            font-size: 18px;
+            box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
+        }
+
+        .logo-text {
+            font-family: var(--font-display);
+            font-size: 24px;
+            font-weight: 800;
+            letter-spacing: 0.5px;
+            background: linear-gradient(to right, #ffffff, #9ca3af);
+            -webkit-background-clip: text;
+            -webkit-text-fill-color: transparent;
+        }
+
+        .meta-info {
+            text-align: right;
+            font-size: 12px;
+            color: var(--text-muted);
+        }
+
+        /* Layout Grid */
+        .layout-grid {
+            display: grid;
+            grid-template-columns: 280px 1fr;
+            gap: 40px;
+            align-items: start;
+        }
+
+        /* Sticky Sidebar Table of Contents */
+        .sidebar {
+            position: sticky;
+            top: 40px;
+            background: var(--surface-color);
+            border: 1px solid var(--surface-border);
+            border-radius: 12px;
+            padding: 24px;
+            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
+        }
+
+        .sidebar-title {
+            font-family: var(--font-display);
+            font-weight: 700;
+            font-size: 16px;
+            text-transform: uppercase;
+            letter-spacing: 1px;
+            color: #ffffff;
+            margin-bottom: 16px;
+            padding-bottom: 8px;
+            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
+        }
+
+        .toc-list {
+            list-style: none;
+            display: flex;
+            flex-direction: column;
+            gap: 12px;
+        }
+
+        .toc-link {
+            color: var(--text-muted);
+            text-decoration: none;
+            font-size: 14px;
+            font-weight: 500;
+            transition: all 0.2s ease;
+            display: inline-block;
+            border-left: 2px solid transparent;
+            padding-left: 10px;
+        }
+
+        .toc-link:hover, .toc-link.active {
+            color: var(--primary);
+            border-left-color: var(--primary);
+            padding-left: 14px;
+        }
+
+        /* Legal Content */
+        .document-container {
+            background: var(--surface-color);
+            border: 1px solid var(--surface-border);
+            border-radius: 16px;
+            padding: 40px 48px;
+            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
+            animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1);
+        }
+
+        .doc-title {
+            font-family: var(--font-display);
+            font-size: 32px;
+            font-weight: 800;
+            line-height: 1.2;
+            margin-bottom: 16px;
+            background: linear-gradient(135deg, #ffffff, #e5e7eb);
+            -webkit-background-clip: text;
+            -webkit-text-fill-color: transparent;
+        }
+
+        .doc-subtitle {
+            font-size: 14px;
+            color: var(--text-muted);
+            margin-bottom: 32px;
+            display: flex;
+            gap: 16px;
+        }
+
+        .alert-box {
+            background: var(--warning-glow);
+            border-left: 4px solid var(--warning);
+            border-radius: 4px;
+            padding: 16px 20px;
+            margin-bottom: 36px;
+            font-size: 14px;
+            color: #fce7f3;
+        }
+
+        .alert-box strong {
+            color: var(--warning);
+            font-family: var(--font-display);
+            text-transform: uppercase;
+            letter-spacing: 0.5px;
+            display: block;
+            margin-bottom: 4px;
+        }
+
+        .doc-section {
+            margin-bottom: 40px;
+            scroll-margin-top: 40px;
+        }
+
+        .doc-section h2 {
+            font-family: var(--font-display);
+            font-size: 20px;
+            font-weight: 700;
+            color: #ffffff;
+            margin-bottom: 16px;
+            display: flex;
+            align-items: center;
+            gap: 10px;
+        }
+
+        .doc-section h2::before {
+            content: '';
+            display: inline-block;
+            width: 6px;
+            height: 20px;
+            background: var(--primary);
+            border-radius: 2px;
+        }
+
+        .doc-section p {
+            color: rgba(243, 244, 246, 0.85);
+            margin-bottom: 16px;
+            font-size: 15px;
+            text-align: justify;
+        }
+
+        .doc-section ul {
+            list-style: none;
+            margin-left: 8px;
+            margin-bottom: 16px;
+        }
+
+        .doc-section li {
+            position: relative;
+            padding-left: 20px;
+            margin-bottom: 10px;
+            font-size: 14.5px;
+            color: rgba(243, 244, 246, 0.8);
+        }
+
+        .doc-section li::before {
+            content: "✓";
+            position: absolute;
+            left: 0;
+            color: var(--success);
+            font-weight: bold;
+        }
+
+        .badge {
+            background: rgba(255, 255, 255, 0.05);
+            padding: 4px 8px;
+            border-radius: 4px;
+            font-family: var(--font-mono);
+            font-size: 12px;
+            color: var(--text-link);
+        }
+
+        /* Footer elements */
+        footer {
+            margin-top: auto;
+            border-top: 1px solid var(--surface-border);
+            padding: 24px 0;
+            text-align: center;
+            font-size: 12px;
+            color: var(--text-muted);
+            z-index: 1;
+            position: relative;
+        }
+
+        .footer-links {
+            display: flex;
+            justify-content: center;
+            gap: 20px;
+            margin-bottom: 12px;
+        }
+
+        .footer-link {
+            color: var(--text-muted);
+            text-decoration: none;
+            transition: color 0.2s ease;
+        }
+
+        .footer-link:hover {
+            color: #ffffff;
+        }
+
+        /* Scroll to top button */
+        .scroll-top {
+            position: fixed;
+            bottom: 30px;
+            right: 30px;
+            background: var(--primary);
+            color: #ffffff;
+            width: 44px;
+            height: 44px;
+            border-radius: 50%;
+            border: none;
+            cursor: pointer;
+            box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            transition: all 0.2s ease;
+            opacity: 0;
+            pointer-events: none;
+            z-index: 99;
+        }
+
+        .scroll-top.visible {
+            opacity: 1;
+            pointer-events: auto;
+        }
+
+        .scroll-top:hover {
+            transform: translateY(-3px);
+            box-shadow: 0 6px 20px rgba(59, 130, 246, 0.6);
+        }
+
+        /* Animations */
+        @@keyframes slideUp {
+            from { opacity: 0; transform: translateY(20px); }
+            to { opacity: 1; transform: translateY(0); }
+        }
+
+        /* Responsive Design */
+        @@media (max-width: 960px) {
+            .layout-grid {
+                grid-template-columns: 1fr;
+            }
+            .sidebar {
+                display: none; /* Hide sidebar table of contents on smaller screens */
+            }
+            .document-container {
+                padding: 30px 24px;
+            }
+        }
+
+        @@media (max-width: 600px) {
+            header {
+                flex-direction: column;
+                gap: 16px;
+                text-align: center;
+                align-items: center;
+            }
+            .meta-info {
+                text-align: center;
+            }
+            .doc-title {
+                font-size: 24px;
+            }
+            .doc-subtitle {
+                flex-direction: column;
+                gap: 8px;
+                margin-bottom: 20px;
+            }
+        }
+    </style>
+</head>
+<body>
+
+    <div class="glow-blob blob-1"></div>
+    <div class="glow-blob blob-2"></div>
+
+    <div class="wrapper">
+        <header>
+            <a href="#" class="logo-group">
+                <div class="logo-icon">S</div>
+                <div class="logo-text">SPMega</div>
+            </a>
+            <div class="meta-info">
+                <div>Версия: <span class="badge">1.0.0-2026</span></div>
+                <div style="margin-top: 4px;">Обновлено: 28 июня 2026</div>
+            </div>
+        </header>
+
+        <main class="layout-grid">
+            <!-- Sidebar Navigation -->
+            <aside class="sidebar">
+                <h3 class="sidebar-title">Содержание</h3>
+                <ul class="toc-list">
+                    <li><a href="#intro" class="toc-link active" id="link-intro">1. Общие положения</a></li>
+                    <li><a href="#minecraft-mod" class="toc-link" id="link-minecraft-mod">2. Использование мода</a></li>
+                    <li><a href="#disclaimer" class="toc-link" id="link-disclaimer">3. Отказ от претензий</a></li>
+                    <li><a href="#data-collection" class="toc-link" id="link-data-collection">4. Сбор данных</a></li>
+                    <li><a href="#privacy" class="toc-link" id="link-privacy">5. Конфиденциальность</a></li>
+                    <li><a href="#changes" class="toc-link" id="link-changes">6. Изменение соглашения</a></li>
+                </ul>
+            </aside>
+
+            <!-- Document Content -->
+            <div class="document-container">
+                <h1 class="doc-title">Пользовательское соглашение</h1>
+                <div class="doc-subtitle">
+                    <span>Свод правил для пользователей модификации Minecraft и сервиса SPMega</span>
+                </div>
+
+                <div class="alert-box">
+                    <strong>Важная информация</strong>
+                    Установка, запуск модификации SPMega для Minecraft или посещение данного сайта означает ваше полное согласие со всеми пунктами данного соглашения. Если вы не согласны с какими-либо условиями, вы обязаны прекратить использование всех связанных сервисов и удалить модификацию.
+                </div>
+
+                <!-- Section 1 -->
+                <section id="intro" class="doc-section">
+                    <h2>Общие положения</h2>
+                    <p>Настоящее Соглашение является публичной офертой и регулирует порядок использования официального программного обеспечения (модификации для Minecraft), а также веб-сервисов и API, предоставляемых под эгидой проекта SPMega.</p>
+                    <p>Соглашение заключается между конечным пользователем (вами) и разработчиками проекта (автором модификации и владельцами сайта). Нажимая кнопку запуска в лаунчере, заходя в игру с активным модом или посещая данный ресурс, вы подтверждаете свою дееспособность и согласие с правилами.</p>
+                </section>
+
+                <!-- Section 2 -->
+                <section id="minecraft-mod" class="doc-section">
+                    <h2>Использование мода для Minecraft</h2>
+                    <p>Модификация SPMega разработана для интеграции игрового процесса Minecraft с нашей платежной и статистической системой. Пользователю предоставляется бесплатное неисключительное право на использование модификации в личных некоммерческих целях.</p>
+                    <p>При использовании модификации запрещено:</p>
+                    <ul>
+                        <li>Декомпилировать, модифицировать код или создавать клоны ПО без прямого письменного согласия разработчиков.</li>
+                        <li>Использовать баги мода или веб-интерфейсов для накрутки баланса, валюты или совершения несанкционированных транзакций.</li>
+                        <li>Использовать модификацию в связке с запрещенными сторонними программами (чит-клиенты, боты и т.д.).</li>
+                    </ul>
+                </section>
+
+                <!-- Section 3 -->
+                <section id="disclaimer" class="doc-section">
+                    <h2>Отказ от претензий (Дисклеймер)</h2>
+                    <p><strong>ПРОГРАММНОЕ ОБЕСПЕЧЕНИЕ ПРЕДОСТАВЛЯЕТСЯ «КАК ЕСТЬ» (AS IS).</strong> Автор модификации и владельцы сайта снимают с себя всю ответственность за любой ущерб, возникший в результате использования мода или веб-ресурсов.</p>
+                    <p>Пользователь осознает и соглашается, что:</p>
+                    <ul>
+                        <li>Автор не несет ответственности за сбои в игровом клиенте Minecraft, потерю игрового прогресса, повреждение файлов сохранений или несовместимость с другими модификациями.</li>
+                        <li>Владельцы сайта не гарантируют 100% бесперебойную доступность серверов API и ведения транзакций.</li>
+                        <li>Пользователь добровольно отказывается от любых финансовых, юридических, моральных или иных материальных претензий к авторам и администрации в случае технических сбоев.</li>
+                    </ul>
+                </section>
+
+                <!-- Section 4 -->
+                <section id="data-collection" class="doc-section">
+                    <h2>Сбор данных и статистики</h2>
+                    <p>Для корректного функционирования игровых транзакций, выписок, защиты от мошенничества и ведения честной игровой статистики, сайт и модификация SPMega осуществляют автоматический сбор технических параметров.</p>
+                    <p>Мы собираем и обрабатываем:</p>
+                    <ul>
+                        <li>Ваш уникальный идентификатор Minecraft (<span class="badge">UUID</span>) и текущий никнейм.</li>
+                        <li>Сведения о версии игры, версии Java и используемой версии модификации.</li>
+                        <li>Ваш текущий IP-адрес для предотвращения мультиаккаунтинга и выявления попыток взлома API.</li>
+                        <li>Техническую информацию о транзакциях (суммы, комментарии, номера виртуальных счетов/карт и идентификаторы).</li>
+                    </ul>
+                </section>
+
+                <!-- Section 5 -->
+                <section id="privacy" class="doc-section">
+                    <h2>Конфиденциальность и безопасность данных</h2>
+                    <p>Мы высоко ценим доверие наших пользователей и гарантируем сохранность собираемой информации. Все личные данные передаются и обрабатываются по защищенным зашифрованным каналам связи (HTTPS/SSL).</p>
+                    <p>Администрация сайта строго обязуется:</p>
+                    <ul>
+                        <li><strong>Не передавать, не продавать и не распространять</strong> ваши личные данные, IP-адреса и статистику третьим лицам.</li>
+                        <li>Использовать собранную анонимизированную статистику исключительно во внутренних аналитических целях для улучшения производительности мода.</li>
+                        <li>Раскрывать информацию только в случаях, прямо предусмотренных действующим законодательством при наличии официальных судебных или правоохранительных запросов.</li>
+                    </ul>
+                </section>
+
+                <!-- Section 6 -->
+                <section id="changes" class="doc-section">
+                    <h2>Изменение условий соглашения</h2>
+                    <p>Администрация оставляет за собой право в одностороннем порядке вносить изменения в настоящее Пользовательское соглашение без предварительного индивидуального уведомления пользователей.</p>
+                    <p>Новая редакция Соглашения вступает в силу с момента ее публикации на данной веб-странице. Мы рекомендуем периодически проверять условия соглашения, чтобы оставаться в курсе актуальных правил использования.</p>
+                </section>
+            </div>
+        </main>
+    </div>
+
+    <footer>
+        <div class="footer-links">
+            <a href="/v1/BillPage/00000000-0000-0000-0000-000000000000" class="footer-link">Проверить чек</a>
+            <span>•</span>
+            <a href="#" class="footer-link">Поддержка</a>
+        </div>
+        <div>&copy; 2026 SPMega. Все права защищены. Minecraft является торговой маркой Mojang Synergies AB.</div>
+    </footer>
+
+    <!-- Scroll to Top Button -->
+    <button class="scroll-top" id="scrollTopBtn" onclick="window.scrollTo({top: 0, behavior: 'smooth'})">
+        <svg width="20" height="20" fill="none" stroke="currentColor" stroke-width="2.5" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" d="M4.5 15.75l7.5-7.5 7.5 7.5" />
+        </svg>
+    </button>
+
+    <script>
+        // Smooth scroll spy to highlight active sidebar links
+        window.addEventListener('DOMContentLoaded', () => {
+            const sections = document.querySelectorAll('.doc-section');
+            const navLinks = document.querySelectorAll('.toc-link');
+            const scrollTopBtn = document.getElementById('scrollTopBtn');
+
+            function highlightNav() {
+                let current = '';
+                
+                // Show/hide scroll top button
+                if (window.scrollY > 300) {
+                    scrollTopBtn.classList.add('visible');
+                } else {
+                    scrollTopBtn.classList.remove('visible');
+                }
+
+                // Scroll spy logic
+                sections.forEach(section => {
+                    const sectionTop = section.offsetTop;
+                    const sectionHeight = section.clientHeight;
+                    if (window.scrollY >= sectionTop - 120) {
+                        current = section.getAttribute('id');
+                    }
+                });
+
+                navLinks.forEach(link => {
+                    link.classList.remove('active');
+                    if (link.getAttribute('href') === `#${current}`) {
+                        link.classList.add('active');
+                    }
+                });
+            }
+
+            window.addEventListener('scroll', highlightNav);
+            highlightNav(); // Trigger once on load
+        });
+    </script>
+</body>
+</html>

backend/SpMega.Backend/Pages/v1/BillPage.cshtml

@@ -0,0 +1,688 @@
+@page "/{id?}"
+@model SpMega.Backend.Pages.v1.BillPage
+
+@{
+    Layout = null;
+}
+
+<!DOCTYPE html>
+<html lang="ru">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Чек транзакции — SPMega</title>
+    
+    <!-- Google Fonts -->
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@300;400;500;700&display=swap" rel="stylesheet">
+
+    <style>
+        :root {
+            --bg-gradient: radial-gradient(circle at 50% 50%, #1a1e29 0%, #0d0f14 100%);
+            --paper-color: #faf9f6;
+            --text-dark: #1f2937;
+            --text-muted: #6b7280;
+            --primary: #10b981;
+            --primary-hover: #059669;
+            --error: #ef4444;
+            --border-color: #e5e7eb;
+        }
+
+        * {
+            box-sizing: border-box;
+            margin: 0;
+            padding: 0;
+        }
+
+        body {
+            font-family: 'Inter', sans-serif;
+            background: var(--bg-gradient);
+            min-height: 100vh;
+            display: flex;
+            flex-direction: column;
+            justify-content: center;
+            align-items: center;
+            padding: 20px;
+            color: #ffffff;
+            overflow-x: hidden;
+        }
+
+        /* Ambient glowing background */
+        .ambient-glow {
+            position: absolute;
+            width: 600px;
+            height: 600px;
+            background: radial-gradient(circle, rgba(16, 185, 129, 0.08) 0%, rgba(0,0,0,0) 70%);
+            top: 50%;
+            left: 50%;
+            transform: translate(-50%, -50%);
+            z-index: 0;
+            pointer-events: none;
+        }
+
+        .receipt-wrapper {
+            position: relative;
+            z-index: 1;
+            display: flex;
+            flex-direction: column;
+            align-items: center;
+            width: 100%;
+            max-width: 400px;
+            animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1);
+        }
+
+        /* Receipt paper style */
+        .receipt-paper {
+            background-color: var(--paper-color);
+            color: var(--text-dark);
+            width: 100%;
+            padding: 40px 28px 30px;
+            position: relative;
+            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
+            font-family: 'JetBrains Mono', monospace;
+            font-size: 13px;
+        }
+
+        /* Torn paper effect using CSS linear gradients */
+        .receipt-paper::before, .receipt-paper::after {
+            content: "";
+            position: absolute;
+            left: 0;
+            right: 0;
+            height: 12px;
+            background-size: 16px 16px;
+            background-repeat: repeat-x;
+            z-index: 2;
+        }
+
+        .receipt-paper::before {
+            top: -12px;
+            background-image: linear-gradient(135deg, transparent 25%, var(--paper-color) 25%, var(--paper-color) 75%, transparent 75%),
+                              linear-gradient(225deg, transparent 25%, var(--paper-color) 25%, var(--paper-color) 75%, transparent 75%);
+        }
+
+        .receipt-paper::after {
+            bottom: -12px;
+            background-image: linear-gradient(45deg, transparent 25%, var(--paper-color) 25%, var(--paper-color) 75%, transparent 75%),
+                              linear-gradient(-45deg, transparent 25%, var(--paper-color) 25%, var(--paper-color) 75%, transparent 75%);
+        }
+
+        /* Stamp style */
+        .stamp {
+            position: absolute;
+            top: 22%;
+            right: 10%;
+            border: 3px double var(--primary);
+            color: var(--primary);
+            font-size: 12px;
+            font-weight: 700;
+            text-transform: uppercase;
+            padding: 4px 10px;
+            transform: rotate(-15deg);
+            opacity: 0.85;
+            border-radius: 4px;
+            user-select: none;
+            letter-spacing: 2px;
+            pointer-events: none;
+            background: rgba(250, 249, 246, 0.8);
+            box-shadow: 0 0 0 2px var(--primary);
+            animation: stampIn 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275) 0.5s both;
+        }
+
+        .stamp.error {
+            border-color: var(--error);
+            color: var(--error);
+            box-shadow: 0 0 0 2px var(--error);
+        }
+
+        /* Header elements */
+        .receipt-header {
+            text-align: center;
+            margin-bottom: 24px;
+        }
+
+        .receipt-logo {
+            font-family: 'Inter', sans-serif;
+            font-weight: 800;
+            font-size: 20px;
+            letter-spacing: 1px;
+            color: #111827;
+            margin-bottom: 4px;
+        }
+
+        .receipt-subtitle {
+            font-size: 10px;
+            color: var(--text-muted);
+            text-transform: uppercase;
+            letter-spacing: 1px;
+        }
+
+        .divider {
+            border-top: 2px dashed #d1d5db;
+            margin: 20px 0;
+            position: relative;
+        }
+
+        .divider::before, .divider::after {
+            content: '';
+            position: absolute;
+            width: 10px;
+            height: 10px;
+            background: #0d0f14; /* cutouts on sides */
+            border-radius: 50%;
+            top: -6px;
+            z-index: 3;
+        }
+        .divider::before { left: -34px; }
+        .divider::after { right: -34px; }
+
+        /* Meta block */
+        .meta-row {
+            display: flex;
+            justify-content: space-between;
+            margin-bottom: 8px;
+            gap: 12px;
+        }
+
+        .meta-label {
+            color: var(--text-muted);
+            flex-shrink: 0;
+        }
+
+        .meta-value {
+            text-align: right;
+            word-break: break-all;
+            color: #111827;
+        }
+
+        .meta-value.bold {
+            font-weight: 700;
+        }
+
+        /* Amount styling */
+        .amount-section {
+            text-align: center;
+            padding: 15px 0;
+        }
+
+        .amount-title {
+            font-size: 11px;
+            color: var(--text-muted);
+            text-transform: uppercase;
+            margin-bottom: 6px;
+            letter-spacing: 0.5px;
+        }
+
+        .amount-val {
+            font-size: 32px;
+            font-weight: 700;
+            color: #111827;
+        }
+
+        /* Comments box */
+        .comment-box {
+            background: rgba(0, 0, 0, 0.03);
+            border-left: 3px solid #9ca3af;
+            padding: 10px 12px;
+            margin-top: 15px;
+            font-style: italic;
+            color: #374151;
+            border-radius: 2px;
+        }
+
+        /* Footer tools */
+        .receipt-footer {
+            text-align: center;
+            margin-top: 30px;
+        }
+
+        .qr-code-wrapper {
+            margin: 15px auto;
+            width: 110px;
+            height: 110px;
+            background: #ffffff;
+            padding: 5px;
+            border: 1px solid #e5e7eb;
+            display: flex;
+            justify-content: center;
+            align-items: center;
+            border-radius: 4px;
+        }
+
+        .qr-code-wrapper img {
+            width: 100%;
+            height: 100%;
+        }
+
+        .barcode {
+            width: 100%;
+            height: 40px;
+            margin: 15px auto 4px;
+            background: repeating-linear-gradient(
+                90deg,
+                #111827,
+                #111827 2px,
+                transparent 2px,
+                transparent 5px,
+                #111827 5px,
+                #111827 6px,
+                transparent 6px,
+                transparent 9px,
+                #111827 9px,
+                #111827 11px,
+                transparent 11px,
+                transparent 13px
+            );
+            opacity: 0.85;
+        }
+
+        .barcode-text {
+            font-size: 9px;
+            color: var(--text-muted);
+            letter-spacing: 4px;
+            text-transform: uppercase;
+        }
+
+        /* Action buttons */
+        .action-buttons {
+            display: flex;
+            gap: 12px;
+            width: 100%;
+            margin-top: 30px;
+            z-index: 1;
+        }
+
+        .btn {
+            flex: 1;
+            padding: 12px 16px;
+            border-radius: 8px;
+            font-family: 'Inter', sans-serif;
+            font-size: 14px;
+            font-weight: 600;
+            border: none;
+            cursor: pointer;
+            display: inline-flex;
+            align-items: center;
+            justify-content: center;
+            gap: 8px;
+            transition: all 0.2s ease;
+            text-decoration: none;
+        }
+
+        .btn-primary {
+            background-color: var(--primary);
+            color: #ffffff;
+            box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
+        }
+
+        .btn-primary:hover {
+            background-color: var(--primary-hover);
+            transform: translateY(-1px);
+            box-shadow: 0 6px 16px rgba(16, 185, 129, 0.4);
+        }
+
+        .btn-secondary {
+            background-color: rgba(255, 255, 255, 0.08);
+            color: #e5e7eb;
+            border: 1px solid rgba(255, 255, 255, 0.1);
+        }
+
+        .btn-secondary:hover {
+            background-color: rgba(255, 255, 255, 0.15);
+            color: #ffffff;
+            transform: translateY(-1px);
+        }
+
+        .btn:active {
+            transform: translateY(0);
+        }
+
+        /* Loading / Error skeletons */
+        .loader-container {
+            display: flex;
+            flex-direction: column;
+            align-items: center;
+            justify-content: center;
+            padding: 50px 0;
+            width: 100%;
+        }
+
+        .spinner {
+            width: 40px;
+            height: 40px;
+            border: 3px solid rgba(16, 185, 129, 0.1);
+            border-radius: 50%;
+            border-top-color: var(--primary);
+            animation: spin 1s ease-in-out infinite;
+            margin-bottom: 16px;
+        }
+
+        .error-state {
+            text-align: center;
+            padding: 30px 10px;
+        }
+
+        .error-icon {
+            font-size: 40px;
+            color: var(--error);
+            margin-bottom: 16px;
+        }
+
+        /* Toast notification */
+        .toast {
+            position: fixed;
+            bottom: 24px;
+            background: rgba(17, 24, 39, 0.9);
+            border: 1px solid rgba(255, 255, 255, 0.1);
+            color: #ffffff;
+            padding: 12px 24px;
+            border-radius: 8px;
+            font-size: 14px;
+            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
+            z-index: 100;
+            display: flex;
+            align-items: center;
+            gap: 8px;
+            transform: translateY(100px);
+            opacity: 0;
+            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
+        }
+
+        .toast.show {
+            transform: translateY(0);
+            opacity: 1;
+        }
+
+        /* Animations */
+        @@keyframes fadeIn {
+            from { opacity: 0; transform: translateY(15px); }
+            to { opacity: 1; transform: translateY(0); }
+        }
+
+        @@keyframes stampIn {
+            from { opacity: 0; transform: rotate(-25deg) scale(1.6); filter: blur(2px); }
+            to { opacity: 0.85; transform: rotate(-15deg) scale(1); filter: blur(0); }
+        }
+
+        @@keyframes spin {
+            to { transform: rotate(360deg); }
+        }
+
+        /* Printable stylesheet */
+        @@media print {
+            body {
+                background: #ffffff !important;
+                color: #000000 !important;
+                padding: 0;
+                margin: 0;
+                display: block;
+            }
+            .ambient-glow, .action-buttons, .toast {
+                display: none !important;
+            }
+            .receipt-wrapper {
+                max-width: 100%;
+                box-shadow: none !important;
+                transform: none !important;
+                animation: none !important;
+            }
+            .receipt-paper {
+                box-shadow: none !important;
+                padding: 10px;
+                border: none;
+                margin: 0 auto;
+                background: #ffffff !important;
+            }
+            .receipt-paper::before, .receipt-paper::after {
+                display: none !important;
+            }
+            .divider::before, .divider::after {
+                display: none !important;
+            }
+            .stamp {
+                background: none !important;
+                border-style: solid !important;
+            }
+        }
+    </style>
+</head>
+<body>
+
+    <div class="ambient-glow"></div>
+
+    <div class="receipt-wrapper">
+        
+        <div class="receipt-paper" id="receiptContent">
+            <!-- Dynamic Content Injected Here -->
+            <div class="loader-container" id="loadingState">
+                <div class="spinner"></div>
+                <div style="color: var(--text-muted)">Получение данных чека...</div>
+            </div>
+        </div>
+
+        <div class="action-buttons" id="actionButtons" style="display: none;">
+            <button class="btn btn-secondary" onclick="copyReceiptLink()">
+                <svg width="16" height="16" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" d="M8 5H6a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2v-1M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 002 2h2a2 2 0 002-2M8 5a2 2 0 012-2h2a2 2 0 012 2m0 0h2a2 2 0 012 2v3m2 4H10m0 0l3-3m-3 3l3 3" />
+                </svg>
+                Ссылка
+            </button>
+            <button class="btn btn-primary" onclick="window.print()">
+                <svg width="16" height="16" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" d="M17 17h2a2 2 0 002-2v-4a2 2 0 00-2-2H5a2 2 0 00-2 2v4a2 2 0 002 2h2m2 4h10a2 2 0 002-2v-3a2 2 0 00-2-2H9a2 2 0 00-2 2v3a2 2 0 002 2zm5-17v2m-6 4h12" />
+                </svg>
+                Печать чека
+            </button>
+        </div>
+    </div>
+
+    <!-- Copy Toast -->
+    <div class="toast" id="copyToast">
+        <svg width="18" height="18" fill="none" stroke="var(--primary)" stroke-width="2.5" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" d="M9 12l2 2 4-4m6 2a9 9 0 11-18 0 9 9 0 0118 0z" />
+        </svg>
+        <span>Ссылка скопирована в буфер обмена</span>
+    </div>
+
+    <script>
+        function getTransactionId() {
+            const urlParams = new URLSearchParams(window.location.search);
+            const idParam = urlParams.get('billId') || urlParams.get('id') || urlParams.get('transactionId');
+            if (idParam) return idParam;
+
+            const pathSegments = window.location.pathname.split('/').filter(p => p);
+            if (pathSegments.length > 0) {
+                return pathSegments[pathSegments.length - 1];
+            }
+            return null;
+        }
+
+        function formatDate(isoString) {
+            try {
+                const date = new Date(isoString);
+                if (isNaN(date.getTime())) return isoString;
+                
+                const pad = (n) => String(n).padStart(2, '0');
+                const d = pad(date.getDate());
+                const m = pad(date.getMonth() + 1);
+                const y = date.getFullYear();
+                const h = pad(date.getHours());
+                const min = pad(date.getMinutes());
+                const s = pad(date.getSeconds());
+                
+                return `${d}.${m}.${y} ${h}:${min}:${s}`;
+            } catch (e) {
+                return isoString;
+            }
+        }
+
+        async function loadBill() {
+            const billId = getTransactionId();
+            const receiptContentEl = document.getElementById('receiptContent');
+            const actionButtonsEl = document.getElementById('actionButtons');
+
+            if (!billId) {
+                renderError('Идентификатор транзакции не указан. Пожалуйста, укажите ShortId в URL-адресе.');
+                return;
+            }
+
+            try {
+                // Fetch transaction details from API
+                const response = await fetch(`/api/v1/transactions/${billId}`);
+                if (!response.ok) {
+                    throw new Error(`Ошибка сервера: ${response.status}`);
+                }
+
+                const transaction = await response.json();
+                
+                // Success stamp and details rendering
+                const formattedDate = formatDate(transaction.transactionDate || new Date().toISOString());
+                const senderCard = (transaction.senderCardNumber);
+                const receiverCard = (transaction.receiverCardNumber);
+                
+                let commentHtml = '';
+                if (transaction.comment && transaction.comment.trim() !== '') {
+                    commentHtml = `
+                        <div class="comment-box">
+                            <strong>Назначение:</strong><br/>
+                            ${escapeHtml(transaction.comment)}
+                        </div>
+                    `;
+                }
+
+                // Make dynamic QR code
+                const qrUrl = encodeURIComponent(window.location.href);
+                const qrCodeSrc = `https://api.qrserver.com/v1/create-qr-code/?size=150x150&data=${qrUrl}&color=111827&bgcolor=faf9f6`;
+
+                receiptContentEl.innerHTML = `
+                    <!-- Inked stamp of completion -->
+                    <div class="stamp">Оплачено</div>
+
+                    <div class="receipt-header">
+                        <div class="receipt-logo">SPMEGA PAY</div>
+                        <div class="receipt-subtitle">Электронная квитанция</div>
+                    </div>
+
+                    <div class="divider"></div>
+
+                    <div class="amount-section">
+                        <div class="amount-title">Сумма платежа</div>
+                        <div class="amount-val">${Number(transaction.amount)} АР</div>
+                    </div>
+
+                    <div class="divider"></div>
+
+                    <div class="meta-row">
+                        <span class="meta-label">ID транзакции:</span>
+                        <span class="meta-value" style="font-size: 11px;">${transaction.id}</span>
+                    </div>
+
+                    <div class="meta-row">
+                        <span class="meta-label">Дата & Время:</span>
+                        <span class="meta-value">${formattedDate}</span>
+                    </div>
+
+                    <div class="divider"></div>
+
+                    <div class="meta-row">
+                        <span class="meta-label">Отправитель:</span>
+                        <span class="meta-value bold">${escapeHtml(transaction.sender?.username || 'Клиент SPMega')}</span>
+                    </div>
+
+                    <div class="meta-row">
+                        <span class="meta-label">Карта списания:</span>
+                        <span class="meta-value">${senderCard}</span>
+                    </div>
+
+                    <div class="divider" style="margin: 10px 0; border-top: 1px dotted #9ca3af;"></div>
+
+                    <div class="meta-row">
+                        <span class="meta-label">Получатель:</span>
+                        <span class="meta-value bold">${escapeHtml(transaction.receiverName || 'Не указан')}</span>
+                    </div>
+
+                    <div class="meta-row">
+                        <span class="meta-label">Карта зачисления:</span>
+                        <span class="meta-value">${receiverCard}</span>
+                    </div>
+
+                    ${commentHtml}
+
+                    <div class="divider"></div>
+
+                    <div class="receipt-footer">
+                        <div style="font-size: 10px; color: var(--text-muted); margin-bottom: 12px; text-transform: uppercase;">
+                            Сканируйте для проверки
+                        </div>
+                        <div class="qr-code-wrapper">
+                            <img src="${qrCodeSrc}" alt="QR-код чека" onerror="this.parentElement.style.display='none'" />
+                        </div>
+                        <div class="barcode"></div>
+                        <div class="barcode-text">spmega*transaction*chk</div>
+                        <div style="font-size: 10px; color: var(--text-muted); margin-top: 15px;">
+                            Спасибо за то, что вы с нами!
+                        </div>
+                    </div>
+                `;
+
+                // Display operations buttons
+                actionButtonsEl.style.display = 'flex';
+
+            } catch (err) {
+                console.error(err);
+                renderError('Не удалось загрузить чек. Убедитесь, что GUID транзакции верен и сервер доступен.');
+            }
+        }
+
+        function renderError(message) {
+            const receiptContentEl = document.getElementById('receiptContent');
+            receiptContentEl.innerHTML = `
+                <div class="stamp error">Ошибка</div>
+                <div class="receipt-header">
+                    <div class="receipt-logo">SPMEGA PAY</div>
+                    <div class="receipt-subtitle">Проблема с транзакцией</div>
+                </div>
+                <div class="divider"></div>
+                <div class="error-state">
+                    <div class="error-icon">⚠</div>
+                    <div style="font-weight: 600; color: #111827; margin-bottom: 8px;">Чек не найден</div>
+                    <div style="color: var(--text-muted); font-size: 12px; line-height: 1.5;">${escapeHtml(message)}</div>
+                </div>
+                <div class="divider"></div>
+                <div class="receipt-footer">
+                    <div class="barcode"></div>
+                    <div class="barcode-text">error*code*404</div>
+                </div>
+            `;
+        }
+
+        function escapeHtml(text) {
+            if (!text) return '';
+            const map = {
+                '&': '&amp;',
+                '<': '&lt;',
+                '>': '&gt;',
+                '"': '&quot;',
+                "'": '&#039;'
+            };
+            return String(text).replace(/[&<>"']/g, function(m) { return map[m]; });
+        }
+
+        function copyReceiptLink() {
+            navigator.clipboard.writeText(window.location.href).then(() => {
+                const toast = document.getElementById('copyToast');
+                toast.classList.add('show');
+                setTimeout(() => {
+                    toast.classList.remove('show');
+                }, 3000);
+            }).catch(err => {
+                console.error('Could not copy text: ', err);
+            });
+        }
+
+        // Initialize loading on DOM ready
+        window.addEventListener('DOMContentLoaded', loadBill);
+    </script>
+</body>
+</html>

backend/SpMega.Backend/Pages/v1/BillPage.cshtml.cs

@@ -0,0 +1,11 @@
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace SpMega.Backend.Pages.v1;
+
+public class BillPage : PageModel
+{
+    public void OnGet()
+    {
+        
+    }
+}

backend/SpMega.Backend/Persistent/Database/AppDbContext.cs

@@ -0,0 +1,25 @@
+using Microsoft.EntityFrameworkCore;
+using MongoDB.EntityFrameworkCore.Extensions;
+using SpMega.Backend.Persistent.Models.Transactions;
+using SpMega.Backend.Persistent.Models.Users;
+
+namespace SpMega.Backend.Persistent.Database;
+
+public class AppDbContext(DbContextOptions<AppDbContext> options) : DbContext(options)
+{
+    internal DbSet<Transaction> Transactions { get; set; }
+    internal DbSet<User> Users { get; set; }
+    internal DbSet<UserSession> UserSessions { get; set; }
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        
+    }
+    
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+        
+
+    }
+}

backend/SpMega.Backend/Persistent/Models/DTO/MojangDTO.cs

@@ -0,0 +1,15 @@
+namespace SpMega.Backend.Persistent.Models.DTO;
+
+public class PropertyDto
+{
+    public string Name { get; set; }
+    public string Value { get; set; }
+    public string Signature { get; set; }
+}
+
+public class MojangDto
+{
+    public string Id { get; set; }
+    public string Name { get; set; }
+    public List<PropertyDto> Properties { get; set; }
+}

backend/SpMega.Backend/Persistent/Models/DTO/UserAccountDTO.cs

@@ -0,0 +1,15 @@
+using SPWorldsApi.Types.Interfaces;
+
+namespace SpMega.Backend.Persistent.Models.DTO;
+
+public class UserAccountDTO : IUserAccount
+{
+    public string id { get; set; }
+    public string username { get; set; }
+    public string minecraftUUID { get; set; }
+    public string status { get; set; }
+    public List<string> roles { get; set; }
+    public ICity city { get; set; }
+    public List<IUserCard> cards { get; set; }
+    public DateTime createdAt { get; set; }
+}

backend/SpMega.Backend/Persistent/Models/Transactions/Transaction.cs

@@ -0,0 +1,19 @@
+using System.Text.Json.Serialization;
+using SpMega.Backend.Persistent.Models.Users;
+
+namespace SpMega.Backend.Persistent.Models.Transactions;
+
+public class Transaction
+{
+    public Guid Id { get; set; }
+    public string ShortId { get; set; } = Program.GenerateRandomString(8);
+    public string ReceiverName { get; set; }
+    public string ReceiverCardNumber { get; set; }
+    [JsonIgnore] public User Sender { get; set; }
+    public string SenderCardNumber { get; set; }
+    
+    public int Amount { get; set; } = 0;
+    public string Comment { get; set; } = "";
+    
+    public DateTime TransactionDate { get; set; } = DateTime.UtcNow;
+}

backend/SpMega.Backend/Persistent/Models/Users/Card.cs

@@ -0,0 +1,17 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace SpMega.Backend.Persistent.Models.Users;
+
+[Owned]
+public class Card
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; }
+    public string SpworldsID { get; set; }
+    public string Token { get; set; }
+    
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; }
+    public DateTime? DeletedAt { get; set; }
+    public bool IsDeleted { get; set; } = false;
+}

backend/SpMega.Backend/Persistent/Models/Users/User.cs

@@ -0,0 +1,18 @@
+using SpMega.Backend.Persistent.Models.Transactions;
+
+namespace SpMega.Backend.Persistent.Models.Users;
+
+public class User
+{
+    public Guid Id { get; set; }
+    public string Username { get; set; }
+    public string Token { get; set; }
+
+    public List<Card> Cards { get; set; } = [];
+    public List<Transaction> Transactions { get; set; } = [];
+    
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; }
+    public DateTime? DeletedAt { get; set; }
+    public bool IsDeleted { get; set; } = false;
+}

backend/SpMega.Backend/Persistent/Models/Users/UserSession.cs

@@ -0,0 +1,15 @@
+namespace SpMega.Backend.Persistent.Models.Users;
+
+public class UserSession
+{
+    public Guid Id { get; set; }
+    public string Token { get; set; }
+    public User? User { get; set; } = null;
+    public Guid UserId { get; set; }
+    public string UserName { get; set; }
+    
+    public DateTime CreatedAt { get; init; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; }
+    public DateTime? DeletedAt { get; set; }
+    public bool IsDeleted { get; set; } = false;
+}

backend/SpMega.Backend/Program.cs

@@ -0,0 +1,93 @@
+using System.Text;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.EntityFrameworkCore;
+using MongoDB.Driver;
+using SpMega.Backend.Authetication;
+using SpMega.Backend.Persistent.Database;
+using SpMega.Backend.Services;
+
+namespace SpMega.Backend;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+        var builder = WebApplication.CreateBuilder(args);
+        builder.Configuration
+            .AddJsonFile("appsettings.json", false)
+            .AddJsonFile("appsettings.Development.json", false)
+            .AddEnvironmentVariables();
+        
+        builder.Services.AddAuthorization();
+        builder.Services.AddLogging(logging =>
+        {
+            logging.AddConsole();
+            logging.AddDebug();
+        });
+        builder.Services
+            .AddScoped<TokenService>()
+            .AddRazorPages();
+        builder.Services
+            .AddHttpLogging(logging =>
+            {
+                logging.LoggingFields = Microsoft.AspNetCore.HttpLogging.HttpLoggingFields.All;
+            })
+            .AddRouting()
+            .AddControllers();
+        
+        
+        builder.Services.AddAuthentication(options =>
+            {
+                options.DefaultAuthenticateScheme = JwtAuthenticationSchemeOptions.DefaultScheme;
+                options.DefaultChallengeScheme = JwtAuthenticationSchemeOptions.DefaultScheme;
+            })
+            .AddScheme<JwtAuthenticationSchemeOptions, JwtAuthHandler>(
+                JwtAuthenticationSchemeOptions.DefaultScheme,
+                options => { });
+
+        builder.Services.AddAuthorizationBuilder()
+            .SetDefaultPolicy(new AuthorizationPolicyBuilder()
+                .RequireAuthenticatedUser()
+                .Build());
+        
+        var serviceCollection = new ServiceCollection();
+        var mongoClient =
+            new MongoClient(builder.Configuration.GetValue<string>("Mongo") ?? "mongodb://curiosity:27018");
+        serviceCollection.AddSingleton<IMongoClient>(mongoClient);
+        
+        builder.Services.AddDbContext<AppDbContext>((_, options) =>
+        {
+            options.UseMongoDB(mongoClient, "spmega");
+        });
+    
+        var app = builder.Build();
+
+        app.UseAuthentication();
+        app.UseAuthorization();
+        app.UseWhen(ctx => ctx.Request.Path.StartsWithSegments("/api"), appBuilder =>
+        {
+            appBuilder.UseHttpLogging();
+        });
+
+        app.MapControllers();
+        app.MapRazorPages();
+
+        app.Run();
+    }
+    
+    public static string GenerateRandomString(int length)
+    {
+        const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+        
+        var random = new Random(); 
+        var result = new StringBuilder(length);
+
+        for (var i = 0; i < length; i++)
+        {
+            var index = random.Next(chars.Length);
+            result.Append(chars[index]);
+        }
+
+        return result.ToString();
+    }
+}

backend/SpMega.Backend/Services/TokenService.cs

@@ -0,0 +1,40 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+using Microsoft.IdentityModel.Tokens;
+
+namespace SpMega.Backend.Services;
+
+public class TokenService(IConfiguration conf)
+{
+    private const int AccessTokenExpirationMinutes = 24;
+    private readonly string _issuer = conf["JWT__Issuer"] ?? "spmega.il.yawaflua.tech";
+    private readonly string _secret = conf["JWT__Secret"] ?? throw new InvalidOperationException("JWT__Secret is not configured.");
+
+    public string GenerateAccessToken(string userName, Guid uuid)
+    {
+        var claims = new List<Claim>
+        {
+            new(JwtRegisteredClaimNames.Name, userName),
+            new (JwtRegisteredClaimNames.UniqueName, uuid.ToString()),
+            new(JwtRegisteredClaimNames.AuthTime, DateTimeOffset.UtcNow.ToUnixTimeSeconds().ToString()),
+            new(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
+        };
+
+        var tokenHandler = new JwtSecurityTokenHandler();
+        var key = Encoding.ASCII.GetBytes(_secret);
+
+        var tokenDescriptor = new SecurityTokenDescriptor
+        {
+            Subject = new ClaimsIdentity(claims),
+            Expires = DateTime.UtcNow.AddHours(AccessTokenExpirationMinutes),
+            Issuer = _issuer,
+            SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature),
+            IssuedAt = DateTime.UtcNow
+        };
+
+        var token = tokenHandler.CreateToken(tokenDescriptor);
+
+        return tokenHandler.WriteToken(token);
+    }
+}

backend/SpMega.Backend/SpMega.Backend.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <Content Include="..\.dockerignore">
+        <Link>.dockerignore</Link>
+      </Content>
+    </ItemGroup>
+
+    <ItemGroup>
+      <Folder Include="Controllers\" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Abstractions" Version="10.0.9" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="10.0.9" />
+      <PackageReference Include="Microsoft.IdentityModel.Tokens" Version="8.19.1" />
+      <PackageReference Include="MongoDB.EntityFrameworkCore" Version="10.0.2" />
+      <PackageReference Include="spworlds-api" Version="1.0.3" />
+      <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="8.19.1" />
+    </ItemGroup>
+
+</Project>

build.gradle

@@ -28,17 +28,11 @@ fabricApi {
 }
 
 repositories {
-    // Add repositories to retrieve artifacts from in here.
-    // You should only use this when depending on other mods because
-    // Loom adds the essential maven repositories to download Minecraft and libraries from automatically.
-    // See https://docs.gradle.org/current/userguide/declaring_repositories.html
-    // for more information about repositories.
-
     maven { url "https://maven.shedaniel.me/" }
+    maven { url "https://maven.terraformersmc.com/" }
 }
 
 dependencies {
-    // To change the versions see the gradle.properties file
     minecraft "com.mojang:minecraft:${project.minecraft_version}"
     mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
     modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
@@ -49,6 +43,8 @@ dependencies {
         exclude(group: "net.fabricmc.fabric-api")
     }
 
+    modCompileOnly "com.terraformersmc:modmenu:11.0.3"
+
     include(implementation("org.xerial:sqlite-jdbc:3.46.1.3"))
     include(clientImplementation("com.google.zxing:core:${project.zxing_version}"))
     include(clientImplementation("com.google.zxing:javase:${project.zxing_version}"))

gradle.properties

@@ -6,7 +6,7 @@ minecraft_version=1.21.11
 yarn_mappings=1.21.11+build.4
 loader_version=0.18.1
 # Mod Properties
-mod_version=0.3-pre-alpha
+mod_version=0.4-pre-alpha
 maven_group=git.yawaflua.tech
 archives_base_name=SPMega
 # Dependencies

src/backend/SpMega.Backend/Program.cs

@@ -1,39 +0,0 @@
-namespace SpMega.Backend;
-
-public class Program
-{
-    public static void Main(string[] args)
-    {
-        var builder = WebApplication.CreateBuilder(args);
-
-        // Add services to the container.
-        builder.Services.AddAuthorization();
-
-
-        var app = builder.Build();
-
-        // Configure the HTTP request pipeline.
-
-        app.UseAuthorization();
-
-        var summaries = new[]
-        {
-            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-        };
-
-        app.MapGet("/weatherforecast", (HttpContext httpContext) =>
-        {
-            var forecast = Enumerable.Range(1, 5).Select(index =>
-                    new WeatherForecast
-                    {
-                        Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
-                        TemperatureC = Random.Shared.Next(-20, 55),
-                        Summary = summaries[Random.Shared.Next(summaries.Length)]
-                    })
-                .ToArray();
-            return forecast;
-        });
-
-        app.Run();
-    }
-}

src/backend/SpMega.Backend/SpMega.Backend.csproj

@@ -1,16 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
-
-    <PropertyGroup>
-        <TargetFramework>net10.0</TargetFramework>
-        <Nullable>enable</Nullable>
-        <ImplicitUsings>enable</ImplicitUsings>
-        <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
-    </PropertyGroup>
-
-    <ItemGroup>
-      <Content Include="..\.dockerignore">
-        <Link>.dockerignore</Link>
-      </Content>
-    </ItemGroup>
-
-</Project>

src/backend/SpMega.Backend/SpMega.Backend.http

@@ -1,6 +0,0 @@
-@SpMega.Backend_HostAddress = http://localhost:5129
-
-GET {{SpMega.Backend_HostAddress}}/weatherforecast/
-Accept: application/json
-
-###

src/backend/SpMega.Backend/WeatherForecast.cs

@@ -1,12 +0,0 @@
-namespace SpMega.Backend;
-
-public class WeatherForecast
-{
-    public DateOnly Date { get; set; }
-
-    public int TemperatureC { get; set; }
-
-    public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-    public string? Summary { get; set; }
-}

src/backend/SpMega.Backend/appsettings.Development.json

@@ -1,8 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  }
-}

src/backend/SpMega.Backend/appsettings.json

@@ -1,9 +0,0 @@
-{
-  "Logging": {
-    "LogLevel": {
-      "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
-    }
-  },
-  "AllowedHosts": "*"
-}

src/client/java/git/yawaflua/tech/spmega/client/ModMenuIntegration.java

@@ -0,0 +1,102 @@
+package git.yawaflua.tech.spmega.client;
+
+import com.terraformersmc.modmenu.api.ConfigScreenFactory;
+import com.terraformersmc.modmenu.api.ModMenuApi;
+import git.yawaflua.tech.spmega.GpsHudPosition;
+import git.yawaflua.tech.spmega.ModConfig;
+import git.yawaflua.tech.spmega.SPMega;
+import git.yawaflua.tech.spmega.client.ui.service.BackendAuthenticator;
+import me.shedaniel.clothconfig2.api.ConfigBuilder;
+import me.shedaniel.clothconfig2.api.ConfigCategory;
+import me.shedaniel.clothconfig2.api.ConfigEntryBuilder;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.text.Text;
+import net.minecraft.util.Formatting;
+
+public class ModMenuIntegration implements ModMenuApi {
+    @Override
+    public ConfigScreenFactory<?> getModConfigScreenFactory() {
+        return parent -> {
+            ConfigBuilder builder = ConfigBuilder.create()
+                    .setParentScreen(parent)
+                    .setTitle(Text.translatable("title.spmega.config"));
+
+            ConfigEntryBuilder entryBuilder = builder.entryBuilder();
+            ConfigCategory general = builder.getOrCreateCategory(Text.translatable("category.spmega.general"));
+
+            ModConfig current = SPMega.getConfig();
+            if (current == null) {
+                current = ModConfig.createDefault();
+            }
+
+            final String[] apiDomain = {current.apiDomain()};
+            final String[] apiToken = {current.apiToken()};
+            final boolean[] allowBackend = {current.allowBackend()};
+            final boolean[] signQuickPayEnabled = {current.signQuickPayEnabled()};
+            final GpsHudPosition[] gpsPosition = {current.gpsPosition()};
+
+            general.addEntry(entryBuilder.startStrField(Text.translatable("option.spmega.api_domain"), current.apiDomain())
+                    .setDefaultValue(ModConfig.DEFAULT_API_DOMAIN)
+                    .setSaveConsumer(newValue -> apiDomain[0] = newValue)
+                    .build());
+
+            general.addEntry(entryBuilder.startStrField(Text.translatable("option.spmega.api_token"), current.apiToken())
+                    .setDefaultValue(ModConfig.DEFAULT_API_TOKEN)
+                    .setSaveConsumer(newValue -> apiToken[0] = newValue)
+                    .build());
+
+            general.addEntry(entryBuilder.startBooleanToggle(Text.translatable("option.spmega.allow_backend"), current.allowBackend())
+                    .setDefaultValue(ModConfig.ALLOW_BACKEND)
+                    .setSaveConsumer(newValue -> allowBackend[0] = newValue)
+                    .build());
+
+            boolean isLoggedIn = !current.apiToken().isEmpty() && !current.apiToken().equals(ModConfig.DEFAULT_API_TOKEN);
+            general.addEntry(entryBuilder.startBooleanToggle(Text.literal("Авторизоваться").formatted(Formatting.RED), isLoggedIn)
+                    .setTooltip(Text.literal("Запустить процесс авторизации через Mojang и ваш бэкенд"))
+                    .setSaveConsumer(newValue -> {
+                        if (newValue) {
+                            BackendAuthenticator.authenticate(MinecraftClient.getInstance());
+                            if (SPMega.getConfig() != null) {
+                                apiToken[0] = SPMega.getConfig().apiToken();
+                            }
+                        } else {
+                            apiToken[0] = ModConfig.DEFAULT_API_TOKEN;
+                        }
+                    })
+                    .build());
+
+            general.addEntry(entryBuilder.startBooleanToggle(Text.translatable("option.spmega.sign_quick_pay"), current.signQuickPayEnabled())
+                    .setDefaultValue(ModConfig.DEFAULT_SIGN_QUICK_PAY_ENABLED)
+                    .setSaveConsumer(newValue -> signQuickPayEnabled[0] = newValue)
+                    .build());
+
+            general.addEntry(entryBuilder.startEnumSelector(
+                            Text.translatable("option.spmega.gps_position"),
+                            GpsHudPosition.class,
+                            current.gpsPosition()
+                    )
+                    .setDefaultValue(ModConfig.DEFAULT_GPS_POSITION)
+                    .setEnumNameProvider(position -> Text.translatable("option.spmega.gps_position." + position.name().toLowerCase()))
+                    .setSaveConsumer(newValue -> gpsPosition[0] = newValue)
+                    .build());
+
+            builder.setSavingRunnable(() -> {
+                boolean gpsEnabledVal = true;
+                if (SPMega.getConfig() != null) {
+                    gpsEnabledVal = SPMega.getConfig().gpsEnabled();
+                }
+                ModConfig updated = new ModConfig(
+                        apiDomain[0],
+                        apiToken[0],
+                        allowBackend[0],
+                        signQuickPayEnabled[0],
+                        gpsEnabledVal,
+                        gpsPosition[0]
+                );
+                SPMega.setConfig(updated);
+            });
+
+            return builder.build();
+        };
+    }
+}

src/client/java/git/yawaflua/tech/spmega/client/SPMegaClient.java

@@ -1,9 +1,12 @@
 package git.yawaflua.tech.spmega.client;
 
+import git.yawaflua.tech.spmega.ModConfig;
 import git.yawaflua.tech.spmega.SPMega;
 import git.yawaflua.tech.spmega.client.qr.QRCodeScanner;
+import git.yawaflua.tech.spmega.client.ui.GpsHudRenderer;
 import git.yawaflua.tech.spmega.client.ui.UiNotifications;
 import git.yawaflua.tech.spmega.client.ui.UiOpeners;
+import git.yawaflua.tech.spmega.client.ui.service.BackendAuthenticator;
 import git.yawaflua.tech.spmega.client.ui.service.BankUiService;
 import net.fabricmc.api.ClientModInitializer;
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
@@ -18,6 +21,7 @@ import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.option.KeyBinding;
 import net.minecraft.client.util.InputUtil;
 import net.minecraft.entity.decoration.ItemFrameEntity;
+import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.text.Text;
 import net.minecraft.util.ActionResult;
 import org.lwjgl.glfw.GLFW;
@@ -29,6 +33,9 @@ public class SPMegaClient implements ClientModInitializer {
     private static final Pattern ISOLATED_FIVE_DIGITS = Pattern.compile("(?<!\\d)(\\d{5})(?!\\d)");
     private static KeyBinding openBankMenuKeyBinding;
     private static KeyBinding scanQrKeyBinding;
+    private static KeyBinding toggleGpsKeyBinding;
+    private static boolean wasPaymentShortcutPressed = false;
+
 
     private static String extractCardNumber(SignBlockEntity signBlockEntity) {
         String candidate = findFiveDigits(signBlockEntity.getFrontText().getMessages(false));
@@ -65,6 +72,7 @@ public class SPMegaClient implements ClientModInitializer {
 
     @Override
     public void onInitializeClient() {
+        GpsHudRenderer.instance();
         openBankMenuKeyBinding = KeyBindingHelper.registerKeyBinding(new KeyBinding(
                 "key.spmega.open_menu",
                 InputUtil.Type.KEYSYM,
@@ -79,6 +87,17 @@ public class SPMegaClient implements ClientModInitializer {
                 KeyBinding.Category.GAMEPLAY
         ));
 
+        toggleGpsKeyBinding = KeyBindingHelper.registerKeyBinding(new KeyBinding(
+                "key.spmega.toggle_gps",
+                InputUtil.Type.KEYSYM,
+                GLFW.GLFW_KEY_J,
+                KeyBinding.Category.GAMEPLAY
+        ));
+
+        if (SPMega.getConfig() != null) {
+            GpsHudRenderer.instance().setEnabled(SPMega.getConfig().gpsEnabled());
+        }
+
         ClientTickEvents.END_CLIENT_TICK.register(client -> {
             UiNotifications.instance().tick();
             while (openBankMenuKeyBinding.wasPressed()) {
@@ -87,9 +106,40 @@ public class SPMegaClient implements ClientModInitializer {
             while (scanQrKeyBinding.wasPressed()) {
                 QRCodeScanner.ScanQrCode(client);
             }
+            while (toggleGpsKeyBinding.wasPressed()) {
+                GpsHudRenderer.instance().toggle();
+                if (SPMega.getConfig() != null) {
+                    ModConfig current = SPMega.getConfig();
+                    ModConfig updated = new ModConfig(
+                            current.apiDomain(),
+                            current.apiToken(),
+                            current.allowBackend(),
+                            current.signQuickPayEnabled(),
+                            GpsHudRenderer.instance().isEnabled(),
+                            current.gpsPosition()
+                    );
+                    SPMega.setConfig(updated);
+                }
+                String status = GpsHudRenderer.instance().isEnabled() ? "включен" : "выключен";
+                UiNotifications.instance().show(Text.literal("GPS Ада " + status));
+            }
+
+            if (client.player != null && client.options != null) {
+                boolean isCombinationPressed = client.options.sprintKey.isPressed() && client.options.sneakKey.isPressed() && client.options.leftKey.isPressed();
+                if (isCombinationPressed) {
+                    if (!wasPaymentShortcutPressed && client.currentScreen == null) {
+                        if (client.targetedEntity instanceof PlayerEntity targetedPlayer && targetedPlayer != client.player) {
+                            String recipient = targetedPlayer.getStringifiedName();
+                            UiOpeners.openPaymentMenu(client, recipient);
+                        }
+                    }
+                    wasPaymentShortcutPressed = true;
+                } else {
+                    wasPaymentShortcutPressed = false;
+                }
+            }
         });
 
-        // World HUD path (when no screen is open).
         HudRenderCallback.EVENT.register((drawContext, tickDeltaManager) -> {
             MinecraftClient client = MinecraftClient.getInstance();
             if (client.currentScreen != null || client.textRenderer == null) {
@@ -101,16 +151,35 @@ public class SPMegaClient implements ClientModInitializer {
                     client.getWindow().getScaledWidth(),
                     client.getWindow().getScaledHeight()
             );
+            GpsHudRenderer.instance().render(
+                    drawContext,
+                    client.textRenderer,
+                    client.getWindow().getScaledWidth(),
+                    client.getWindow().getScaledHeight()
+            );
         });
 
-        // Screen path (for all GUI screens).
+        ScreenEvents.AFTER_INIT.register((client, screen, scaledWidth, scaledHeight) -> {
-        ScreenEvents.AFTER_INIT.register((client, screen, scaledWidth, scaledHeight) ->
+                    ScreenEvents.afterRender(screen).register((screenInstance, drawContext, mouseX, mouseY, tickDelta) -> {
-                ScreenEvents.afterRender(screen).register((screenInstance, drawContext, mouseX, mouseY, tickDelta) -> {
+                        if (client.textRenderer == null) {
-                    if (client.textRenderer == null) {
+                            return;
-                        return;
+                        }
-                    }
+                        UiNotifications.instance().render(drawContext, client.textRenderer, scaledWidth, scaledHeight);
-                    UiNotifications.instance().render(drawContext, client.textRenderer, scaledWidth, scaledHeight);
+                    });
-                })
+//                    CompletableFuture.supplyAsync(() -> BackendAuthenticator.authenticate(client))
+//                            .thenAccept(authResult -> {
+//                                if (authResult) {
+//                                    System.out.println("SPMega: Authenticated on backend successfully.");
+//                                } else {
+//                                    System.err.println("SPMega: Authentication on backend failed");
+//                                }
+//                            })
+//                            .exceptionally(ex -> {
+//                                System.err.println("SPMega: Authentication error: " + ex.getMessage());
+//                                return null;
+//                            });
+
+                }
         );
 
         ClientPlayConnectionEvents.JOIN.register((handler, sender, client) -> {
@@ -169,5 +238,8 @@ public class SPMegaClient implements ClientModInitializer {
         });
 
         new ChatListener().register();
+        BackendAuthenticator.authenticate(MinecraftClient.getInstance());
+        System.out.println("Author of SPMega make it with 4 cans of monster");
+        System.out.println("Initialized beshalom! Tieie tovim!");
     }
 }

src/client/java/git/yawaflua/tech/spmega/client/ui/CardScreen.java

@@ -9,12 +9,14 @@ import net.minecraft.text.Text;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.concurrent.CompletableFuture;
 
 public class CardScreen extends Screen {
     private final Screen parent;
     private final BankUiService bankUiService = BankUiService.instance();
     private final UiNotifications notifications = UiNotifications.instance();
     private final List<ButtonWidget> cardButtons = new ArrayList<>();
+    private ButtonWidget historyButton;
 
     public CardScreen(Screen parent) {
         super(Text.literal("Управление картами"));
@@ -44,16 +46,22 @@ public class CardScreen extends Screen {
         }
 
         this.addDrawableChild(ButtonWidget.builder(Text.literal("Удалить"), button -> {
-            bankUiService.removeSelectedCard();
+            CompletableFuture.supplyAsync(() -> {
+                bankUiService.removeSelectedCard();
+                return true;
+            });
             notifications.showMessage(bankUiService.getLastMessage());
             this.clearAndInit();
         }).dimensions(rightX, startY, columnWidth, 20).build());
 
-        this.addDrawableChild(ButtonWidget.builder(Text.literal("Изменить"), button -> {
+        this.addDrawableChild(ButtonWidget.builder(Text.literal("Обновить"), button -> {
             String playerUuid = this.client != null && this.client.player != null
                     ? this.client.player.getUuidAsString()
                     : "";
-            bankUiService.refreshSelectedCard(playerUuid);
+            CompletableFuture.supplyAsync(() -> {
+                bankUiService.refreshSelectedCard(playerUuid);
+                return true;
+            });
             String message = bankUiService.getLastMessage().isBlank() ? "Карта обновлена" : bankUiService.getLastMessage();
             notifications.showMessage(message);
             this.clearAndInit();
@@ -69,6 +77,18 @@ public class CardScreen extends Screen {
             }));
         }).dimensions(rightX, startY + 48, columnWidth, 20).build());
 
+        historyButton = this.addDrawableChild(ButtonWidget.builder(Text.literal("История"), button -> {
+            if (this.client == null) {
+                return;
+            }
+            CardViewModel selected = bankUiService.getSelectedCard();
+            if (selected == null) {
+                notifications.show(Text.literal("Сначала выбери или добавь карту"));
+                return;
+            }
+            this.client.setScreen(new TransactionHistoryScreen(this, selected.id(), selected.title()));
+        }).dimensions(rightX, startY + 72, columnWidth, 20).build());
+
         this.addDrawableChild(ButtonWidget.builder(Text.literal("Назад"), button -> this.close())
                 .dimensions(rightX, startY + 120, columnWidth, 20)
                 .build());
@@ -119,5 +139,9 @@ public class CardScreen extends Screen {
             button.setMessage(Text.literal(prefix + cards.get(i).title() + suffix));
             button.active = !selected;
         }
+
+        if (historyButton != null) {
+            historyButton.active = !cards.isEmpty();
+        }
     }
 }

src/client/java/git/yawaflua/tech/spmega/client/ui/GpsHudRenderer.java

@@ -0,0 +1,238 @@
+package git.yawaflua.tech.spmega.client.ui;
+
+import com.google.gson.Gson;
+import git.yawaflua.tech.spmega.GpsHudPosition;
+import git.yawaflua.tech.spmega.SPMega;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.font.TextRenderer;
+import net.minecraft.client.gui.DrawContext;
+import net.minecraft.text.Text;
+import net.minecraft.world.World;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+public final class GpsHudRenderer {
+    private static final GpsHudRenderer INSTANCE = new GpsHudRenderer();
+    private final Object citiesLock = new Object();
+    private boolean enabled = true;
+    private List<City> cities = new ArrayList<>();
+
+    private GpsHudRenderer() {
+        ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor(r -> {
+            Thread thread = new Thread(r, "SPMega-City-Poller");
+            thread.setDaemon(true);
+            return thread;
+        });
+        scheduler.scheduleAtFixedRate(this::fetchCities, 0, 5, TimeUnit.HOURS);
+    }
+
+    public static GpsHudRenderer instance() {
+        return INSTANCE;
+    }
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+    }
+
+    public void toggle() {
+        this.enabled = !this.enabled;
+    }
+
+    private void fetchCities() {
+        try {
+            HttpClient client = HttpClient.newHttpClient();
+            HttpRequest request = HttpRequest.newBuilder()
+                    .uri(URI.create("https://spm-map.tonyaleksandr.ru/api/map/territories"))
+                    .GET()
+                    .build();
+            HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+            if (response.statusCode() == 200) {
+                TerritoryWrapper[] parsed = new Gson().fromJson(response.body(), TerritoryWrapper[].class);
+                if (parsed != null) {
+                    List<City> list = new ArrayList<>();
+                    for (TerritoryWrapper w : parsed) {
+                        if (w != null && w.territory != null && w.territory.nether_portal != null && w.territory.nether_portal.length >= 2) {
+                            City c = new City();
+                            c.name = w.territory.name;
+                            c.netherX = w.territory.nether_portal[0];
+                            c.netherZ = w.territory.nether_portal[1];
+                            list.add(c);
+                        }
+                    }
+                    synchronized (citiesLock) {
+                        cities = list;
+                    }
+                }
+            }
+        } catch (Exception ignored) {
+        }
+    }
+
+    public void render(DrawContext context, TextRenderer textRenderer, int width, int height) {
+        if (!enabled) {
+            return;
+        }
+
+        MinecraftClient client = MinecraftClient.getInstance();
+        if (client.world == null || client.player == null) {
+            return;
+        }
+
+        if (client.world.getRegistryKey() != World.NETHER) {
+            return;
+        }
+
+        double playerX = client.player.getX();
+        double playerZ = client.player.getZ();
+
+        LaneInfo playerLane = new LaneInfo(Math.round(playerX), Math.round(playerZ));
+
+        String titleText = "§7Ветка: " + playerLane.name + " §7(§f" + playerLane.coord + "§7)";
+        String offsetText = "§7Смещение: §f" + (playerLane.offset == 0 ? "0" : (playerLane.offset > 0 ? "+" + playerLane.offset : playerLane.offset));
+
+        City nearestCity = null;
+        double minDistanceSq = Double.MAX_VALUE;
+        for (City city : cities) {
+            double dx = playerX - (city.netherX / 8);
+            double dz = playerZ - (city.netherZ / 8);
+            double distSq = Math.sqrt(dx * dx + dz * dz);
+            if (distSq < minDistanceSq) {
+                minDistanceSq = distSq;
+                nearestCity = city;
+            }
+        }
+
+        String cityText = null;
+        if (nearestCity != null) {
+            long cx = Math.round(nearestCity.netherX / 8.0);
+            long cz = Math.round(nearestCity.netherZ / 8.0);
+            LaneInfo cityLane = new LaneInfo(cx, cz);
+            cityText = "§7Ближайший: §f" + nearestCity.name + " §7~(§f" + cityLane.name + " §f" + cityLane.coord + "§7, §7см: §f" + (cityLane.offset == 0 ? "0" : (cityLane.offset > 0 ? "+" + cityLane.offset : cityLane.offset)) + "§7)";
+        }
+
+        int padding = 6;
+        int lineSpacing = 2;
+        int textWidth = Math.max(textRenderer.getWidth(Text.literal(titleText)), textRenderer.getWidth(Text.literal(offsetText)));
+        if (cityText != null) {
+            textWidth = Math.max(textWidth, textRenderer.getWidth(Text.literal(cityText)));
+        }
+
+        int boxWidth = textWidth + padding * 2 + 6;
+        int linesCount = cityText != null ? 3 : 2;
+        int boxHeight = textRenderer.fontHeight * linesCount + lineSpacing * (linesCount - 1) + padding * 2;
+
+        GpsHudPosition position = GpsHudPosition.TOP_CENTER;
+        if (SPMega.getConfig() != null) {
+            position = SPMega.getConfig().gpsPosition();
+        }
+
+        int boxX;
+        int boxY;
+
+        switch (position) {
+            case TOP_RIGHT:
+                boxX = width - boxWidth - 10;
+                boxY = 10;
+                break;
+            case BOTTOM_LEFT:
+                boxX = 10;
+                boxY = height - boxHeight - 10;
+                break;
+            case BOTTOM_RIGHT:
+                boxX = width - boxWidth - 10;
+                boxY = height - boxHeight - 10;
+                break;
+            case TOP_CENTER:
+                boxX = (width - boxWidth) / 2;
+                boxY = 10;
+                break;
+            case BOTTOM_CENTER:
+                boxX = (width - boxWidth) / 2;
+                boxY = height - boxHeight - 10;
+                break;
+            case TOP_LEFT:
+            default:
+                boxX = 10;
+                boxY = 10;
+                break;
+        }
+
+        int bgCol = 0x90101010;
+        context.fill(boxX, boxY, boxX + boxWidth, boxY + boxHeight, bgCol);
+
+        int barWidth = 3;
+        context.fill(boxX + padding, boxY + padding, boxX + padding + barWidth, boxY + boxHeight - padding, playerLane.color);
+
+        int textX = boxX + padding + barWidth + 4;
+        int textY = boxY + padding;
+        context.drawTextWithShadow(textRenderer, Text.literal(titleText), textX, textY, 0xFFFFFFFF);
+        context.drawTextWithShadow(textRenderer, Text.literal(offsetText), textX, textY + textRenderer.fontHeight + lineSpacing, 0xFFFFFFFF);
+        if (cityText != null) {
+            context.drawTextWithShadow(textRenderer, Text.literal(cityText), textX, textY + (textRenderer.fontHeight + lineSpacing) * 2, 0xFFFFFFFF);
+        }
+    }
+
+    private static class City {
+        String name;
+        int netherX;
+        int netherZ;
+    }
+
+    private static class TerritoryWrapper {
+        Territory territory;
+    }
+
+    private static class Territory {
+        String name;
+        int[] nether_portal;
+    }
+
+    private static class LaneInfo {
+        String name;
+        int color;
+        long coord;
+        long offset;
+
+        LaneInfo(long x, long z) {
+            long absX = Math.abs(x);
+            long absZ = Math.abs(z);
+            if (absX > absZ) {
+                if (x > 0) {
+                    name = "§aЗеленая";
+                    color = 0xFF55FF55;
+                    coord = x;
+                    offset = z;
+                } else {
+                    name = "§9Синяя";
+                    color = 0xFF5555FF;
+                    coord = absX;
+                    offset = z;
+                }
+            } else {
+                if (z < 0) {
+                    name = "§cКрасная";
+                    color = 0xFFFF5555;
+                    coord = absZ;
+                    offset = x;
+                } else {
+                    name = "§eЖелтая";
+                    color = 0xFFFFFF55;
+                    coord = absZ;
+                    offset = x;
+                }
+            }
+        }
+    }
+}

src/client/java/git/yawaflua/tech/spmega/client/ui/TransactionHistoryScreen.java

@@ -0,0 +1,124 @@
+package git.yawaflua.tech.spmega.client.ui;
+
+import git.yawaflua.tech.spmega.client.ui.service.BackendAuthenticator;
+import git.yawaflua.tech.spmega.client.ui.service.BankDatabase.LocalTransaction;
+import git.yawaflua.tech.spmega.client.ui.service.BankUiService;
+import net.minecraft.client.gui.DrawContext;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.client.gui.widget.ButtonWidget;
+import net.minecraft.text.Text;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+
+public class TransactionHistoryScreen extends Screen {
+    private final Screen parent;
+    private final String cardId;
+    private final String cardTitle;
+    private final List<LocalTransaction> transactions = new ArrayList<>();
+    private boolean loading = true;
+    private String errorMessage = "";
+
+    public TransactionHistoryScreen(Screen parent, String cardId, String cardTitle) {
+        super(Text.literal("История транзакций"));
+        this.parent = parent;
+        this.cardId = cardId;
+        this.cardTitle = cardTitle;
+    }
+
+    @Override
+    protected void init() {
+        int centerX = this.width / 2;
+        int startY = this.height / 2 + 50;
+
+        this.addDrawableChild(ButtonWidget.builder(Text.literal("Назад"), button -> this.close())
+                .dimensions(centerX - 60, startY + 10, 120, 20)
+                .build());
+
+        loadTransactions();
+    }
+
+    private void loadTransactions() {
+        loading = true;
+        errorMessage = "";
+        transactions.clear();
+
+        CompletableFuture.runAsync(() -> {
+            try {
+                List<LocalTransaction> list = null;
+                git.yawaflua.tech.spmega.ModConfig config = git.yawaflua.tech.spmega.SPMega.getConfig();
+                if (config != null && config.allowBackend()) {
+                    try {
+                        list = BackendAuthenticator.fetchTransactionsFromBackend(cardId);
+                    } catch (Exception e) {
+                        System.err.println("[SPMEGA] Failed to fetch transactions from server, falling back to DB: " + e.getMessage());
+                    }
+                }
+
+                if (list == null) {
+                    list = BankUiService.instance().getDatabase().loadTransferHistory(cardId);
+                }
+
+                List<LocalTransaction> finalList = list;
+                if (this.client != null) {
+                    this.client.execute(() -> {
+                        this.transactions.addAll(finalList);
+                        this.loading = false;
+                    });
+                }
+            } catch (Exception e) {
+                if (this.client != null) {
+                    this.client.execute(() -> {
+                        this.errorMessage = e.getMessage();
+                        this.loading = false;
+                    });
+                }
+            }
+        });
+    }
+
+    @Override
+    public void close() {
+        if (this.client != null) {
+            this.client.setScreen(parent);
+        }
+    }
+
+    @Override
+    public void render(DrawContext context, int mouseX, int mouseY, float delta) {
+        super.render(context, mouseX, mouseY, delta);
+
+        int centerX = this.width / 2;
+        int startY = 50;
+
+        context.drawCenteredTextWithShadow(this.textRenderer, this.title, centerX, 20, 0xFFFFFF);
+        context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Карта: " + cardTitle), centerX, 35, 0xBFBFBF);
+
+        if (loading) {
+            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Загрузка транзакций..."), centerX, this.height / 2 - 10, 0xCCCCCC);
+        } else if (!errorMessage.isEmpty()) {
+            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Ошибка: " + errorMessage), centerX, this.height / 2 - 10, 0xFF5555);
+        } else if (transactions.isEmpty()) {
+            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Транзакций не найдено"), centerX, this.height / 2 - 10, 0xCCCCCC);
+        } else {
+            int y = startY + 15;
+            for (int i = 0; i < Math.min(6, transactions.size()); i++) {
+                LocalTransaction tx = transactions.get(i);
+
+                String amountText = tx.amount() + " АР";
+                String dateText = tx.createdAt();
+                if (dateText.length() > 19) {
+                    dateText = dateText.substring(0, 19).replace("T", " ");
+                }
+                String commentText = tx.comment().isEmpty() ? "" : " (" + tx.comment() + ")";
+
+                String line = String.format("%s -> %s | %s%s", dateText, tx.receiver(), amountText, commentText);
+                int color = tx.status().equalsIgnoreCase("SUCCESS") ? 0x55FF55 : 0xFF5555;
+
+                context.drawCenteredTextWithShadow(this.textRenderer, Text.literal(line), centerX, y, color);
+                y += 18;
+            }
+        }
+    }
+}

src/client/java/git/yawaflua/tech/spmega/client/ui/service/BackendAuthenticator.java

@@ -0,0 +1,368 @@
+package git.yawaflua.tech.spmega.client.ui.service;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.mojang.authlib.exceptions.AuthenticationException;
+import com.mojang.authlib.minecraft.MinecraftSessionService;
+import git.yawaflua.tech.spmega.ModConfig;
+import git.yawaflua.tech.spmega.SPMega;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.session.Session;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+public class BackendAuthenticator {
+
+    public static boolean authenticate(MinecraftClient client) {
+        Session session = client.getSession();
+        if (session == null || session.getUuidOrNull() == null) {
+            System.err.println("Cannot authenticate: Client has no valid session.");
+            return false;
+        }
+
+        MinecraftSessionService sessionService = client.getApiServices().sessionService();
+
+        try {
+            var serverId = sendStartSessionRequestToBackend(session.getUsername(), session.getUuidOrNull());
+            System.out.println("[SPMEGA] Trying to auth in mojang with serverId: " + serverId);
+            sessionService.joinServer(
+                    session.getUuidOrNull(),
+                    session.getAccessToken(),
+                    serverId
+            );
+            System.out.println("[SPMEGA] Sending session submitter to backend");
+
+            return sendAuthRequestToBackend(session.getUuidOrNull(), serverId);
+
+        } catch (AuthenticationException e) {
+            System.err.println("I cant auth by Mojang: " + e.getMessage());
+            System.err.println("Please check your credentials and try again.");
+            return false;
+
+        } catch (Exception e) {
+            System.err.println("Failed to authenticate with backend: " + e.getMessage());
+            return false;
+
+        }
+    }
+
+    private static String sendStartSessionRequestToBackend(String username, UUID uuid) throws IOException, InterruptedException {
+        ModConfig config = SPMega.getConfig();
+        String apiDomain = (config != null) ? config.apiDomain() : ModConfig.DEFAULT_API_DOMAIN;
+        if (apiDomain == null || apiDomain.isBlank()) {
+            apiDomain = ModConfig.DEFAULT_API_DOMAIN;
+        }
+        if (apiDomain.endsWith("/")) {
+            apiDomain = apiDomain.substring(0, apiDomain.length() - 1);
+        }
+
+        JsonObject jsonPayload = new JsonObject();
+        jsonPayload.addProperty("userName", username);
+        jsonPayload.addProperty("userUUID", uuid.toString());
+        String requestBody = jsonPayload.toString();
+
+        String url = apiDomain + "/api/v1/auth/start";
+
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder(URI.create(url))
+                .header("Content-Type", "application/json")
+                .header("Accept", "application/json")
+                .method("POST", HttpRequest.BodyPublishers.ofString(requestBody))
+                .build();
+
+        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+        if (response.statusCode() != 200) {
+            System.err.println("[SPMEGA] Server returned status code " + response.statusCode() + " on start: " + response.body());
+            throw new IOException("Server returned status code " + response.statusCode() + " on start: " + response.body());
+        }
+
+        JsonObject json = JsonParser.parseString(response.body()).getAsJsonObject();
+        if (json.has("sessionId")) {
+            return json.get("sessionId").getAsString();
+        } else {
+            System.err.println("[SPMEGA] Invalid response from start endpoint: " + response.body());
+            throw new IOException("Invalid response from start endpoint: " + response.body());
+        }
+    }
+
+    private static boolean sendAuthRequestToBackend(UUID uuid, String serverId) throws IOException, InterruptedException {
+        ModConfig config = SPMega.getConfig();
+        String apiDomain = (config != null) ? config.apiDomain() : ModConfig.DEFAULT_API_DOMAIN;
+        if (apiDomain == null || apiDomain.isBlank()) {
+            apiDomain = ModConfig.DEFAULT_API_DOMAIN;
+        }
+        if (apiDomain.endsWith("/")) {
+            apiDomain = apiDomain.substring(0, apiDomain.length() - 1);
+        }
+
+        JsonObject jsonPayload = new JsonObject();
+        jsonPayload.addProperty("userUUID", uuid.toString());
+        jsonPayload.addProperty("sessionId", serverId);
+        String requestBody = jsonPayload.toString();
+
+        String url = apiDomain + "/api/v1/auth/validate";
+
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder(URI.create(url))
+                .header("Content-Type", "application/json")
+                .header("Accept", "application/json")
+                .POST(HttpRequest.BodyPublishers.ofString(requestBody))
+                .build();
+
+        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+        if (response.statusCode() != 200) {
+            System.err.println("[SPMEGA] Server returned status code " + response.statusCode() + " on validate: " + response.body());
+            throw new IOException("Server returned status code " + response.statusCode() + " on validate: " + response.body());
+        }
+
+        JsonObject json = JsonParser.parseString(response.body()).getAsJsonObject();
+        if (json.has("token")) {
+            String token = json.get("token").getAsString();
+            if (config != null) {
+                ModConfig updated = new ModConfig(
+                        config.apiDomain(),
+                        token,
+                        config.allowBackend(),
+                        config.signQuickPayEnabled(),
+                        config.gpsEnabled(),
+                        config.gpsPosition()
+                );
+                SPMega.setConfig(updated);
+                System.out.println("[SPMEGA] Backend auth successful, saved token.");
+                return true;
+            } else {
+                System.err.println("[SPMEGA] Config is null, cannot save token.");
+                throw new IOException("Config is null, cannot save token.");
+            }
+        } else {
+            System.err.println("[SPMEGA] Invalid response from validate endpoint: " + response.body());
+            throw new IOException("Invalid response from validate endpoint: " + response.body());
+        }
+    }
+
+    public static void sendCardToBackend(String cardId, String cardToken) {
+        ModConfig config = SPMega.getConfig();
+        if (config == null || !config.allowBackend()) {
+            return;
+        }
+
+        String apiDomain = config.apiDomain();
+        if (apiDomain == null || apiDomain.isBlank()) {
+            apiDomain = ModConfig.DEFAULT_API_DOMAIN;
+        }
+        if (apiDomain.endsWith("/")) {
+            apiDomain = apiDomain.substring(0, apiDomain.length() - 1);
+        }
+
+        String url = apiDomain + "/api/v1/auth/cards";
+
+        JsonObject jsonPayload = new JsonObject();
+        jsonPayload.addProperty("id", cardId);
+        jsonPayload.addProperty("token", cardToken);
+        String requestBody = jsonPayload.toString();
+
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder(URI.create(url))
+                .header("Content-Type", "application/json")
+                .header("Accept", "application/json")
+                .header("Authorization", "Bearer " + config.apiToken())
+                .PUT(HttpRequest.BodyPublishers.ofString(requestBody))
+                .build();
+
+        httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+                .thenAccept(response -> {
+                    if (response.statusCode() != 200 && response.statusCode() != 204) {
+                        System.err.println("[SPMEGA] Failed to send card to backend: status code "
+                                + response.statusCode() + ", body: " + response.body());
+                    } else {
+                        System.out.println("[SPMEGA] Card successfully synchronized with backend.");
+                    }
+                })
+                .exceptionally(throwable -> {
+                    System.err.println("[SPMEGA] Error sending card to backend: " + throwable.getMessage());
+                    return null;
+                });
+    }
+
+    public static List<CardCredentials> fetchCardsFromBackend() throws IOException, InterruptedException {
+        ModConfig config = SPMega.getConfig();
+        if (config == null || !config.allowBackend()) {
+            return List.of();
+        }
+
+        String apiDomain = config.apiDomain();
+        if (apiDomain == null || apiDomain.isBlank()) {
+            apiDomain = ModConfig.DEFAULT_API_DOMAIN;
+        }
+        if (apiDomain.endsWith("/")) {
+            apiDomain = apiDomain.substring(0, apiDomain.length() - 1);
+        }
+
+        String url = apiDomain + "/api/v1/auth/cards";
+
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder(URI.create(url))
+                .header("Accept", "application/json")
+                .header("Authorization", "Bearer " + config.apiToken())
+                .GET()
+                .build();
+
+        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+        if (response.statusCode() != 200) {
+            throw new IOException("Server returned status code " + response.statusCode() + " on fetch cards.");
+        }
+
+        com.google.gson.JsonArray cardsArray = JsonParser.parseString(response.body()).getAsJsonArray();
+        List<CardCredentials> cards = new ArrayList<>();
+        for (com.google.gson.JsonElement el : cardsArray) {
+            JsonObject cardJson = el.getAsJsonObject();
+            String cardId = "";
+            if (cardJson.has("cardId") && !cardJson.get("cardId").isJsonNull()) {
+                cardId = cardJson.get("cardId").getAsString();
+            } else if (cardJson.has("id") && !cardJson.get("id").isJsonNull()) {
+                cardId = cardJson.get("id").getAsString();
+            }
+
+            String cardToken = "";
+            if (cardJson.has("cardToken") && !cardJson.get("cardToken").isJsonNull()) {
+                cardToken = cardJson.get("cardToken").getAsString();
+            } else if (cardJson.has("token") && !cardJson.get("token").isJsonNull()) {
+                cardToken = cardJson.get("token").getAsString();
+            }
+
+            if (!cardId.isEmpty() && !cardToken.isEmpty()) {
+                cards.add(new CardCredentials(cardId, cardToken));
+            }
+        }
+        return cards;
+    }
+
+    public static void deleteCardOnBackend(String cardId) {
+        ModConfig config = SPMega.getConfig();
+        if (config == null || !config.allowBackend()) {
+            return;
+        }
+
+        String apiDomain = config.apiDomain();
+        if (apiDomain == null || apiDomain.isBlank()) {
+            apiDomain = ModConfig.DEFAULT_API_DOMAIN;
+        }
+        if (apiDomain.endsWith("/")) {
+            apiDomain = apiDomain.substring(0, apiDomain.length() - 1);
+        }
+
+        String url = apiDomain + "/api/v1/auth/cards/" + cardId;
+
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder(URI.create(url))
+                .header("Accept", "application/json")
+                .header("Authorization", "Bearer " + config.apiToken())
+                .DELETE()
+                .build();
+
+        httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+                .thenAccept(response -> {
+                    if (response.statusCode() != 200 && response.statusCode() != 204) {
+                        System.err.println("[SPMEGA] Failed to delete card from backend: status code "
+                                + response.statusCode() + ", body: " + response.body());
+                    } else {
+                        System.out.println("[SPMEGA] Card successfully deleted from backend.");
+                    }
+                })
+                .exceptionally(throwable -> {
+                    System.err.println("[SPMEGA] Error deleting card from backend: " + throwable.getMessage());
+                    return null;
+                });
+    }
+
+    public static boolean createTransactionOnBackend(String senderCardId, String receiver, long amount, String comment) throws IOException, InterruptedException {
+        ModConfig config = SPMega.getConfig();
+        if (config == null) {
+            throw new IOException("ModConfig is null");
+        }
+
+        String apiDomain = config.apiDomain();
+        if (apiDomain == null || apiDomain.isBlank()) {
+            apiDomain = ModConfig.DEFAULT_API_DOMAIN;
+        }
+        if (apiDomain.endsWith("/")) {
+            apiDomain = apiDomain.substring(0, apiDomain.length() - 1);
+        }
+
+        String url = apiDomain + "/api/v1/transactions";
+
+        JsonObject jsonPayload = new JsonObject();
+        jsonPayload.addProperty("senderCardId", senderCardId);
+        jsonPayload.addProperty("cardId", senderCardId);
+        jsonPayload.addProperty("receiver", receiver);
+        jsonPayload.addProperty("recipient", receiver);
+        jsonPayload.addProperty("amount", amount);
+        jsonPayload.addProperty("comment", comment);
+        String requestBody = jsonPayload.toString();
+
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder(URI.create(url))
+                .header("Content-Type", "application/json")
+                .header("Accept", "application/json")
+                .header("Authorization", "Bearer " + config.apiToken())
+                .PUT(HttpRequest.BodyPublishers.ofString(requestBody))
+                .build();
+
+        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+        if (response.statusCode() == 200 || response.statusCode() == 201 || response.statusCode() == 204) {
+            return true;
+        } else {
+            throw new IOException("Server returned status code " + response.statusCode() + ": " + response.body());
+        }
+    }
+
+    public static List<BankDatabase.LocalTransaction> fetchTransactionsFromBackend(String cardId) throws IOException, InterruptedException {
+        ModConfig config = SPMega.getConfig();
+        if (config == null || !config.allowBackend()) {
+            return List.of();
+        }
+
+        String apiDomain = config.apiDomain();
+        if (apiDomain == null || apiDomain.isBlank()) {
+            apiDomain = ModConfig.DEFAULT_API_DOMAIN;
+        }
+        if (apiDomain.endsWith("/")) {
+            apiDomain = apiDomain.substring(0, apiDomain.length() - 1);
+        }
+
+        String url = apiDomain + "/api/v1/transactions?cardId=" + cardId;
+
+        HttpClient httpClient = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder(URI.create(url))
+                .header("Accept", "application/json")
+                .header("Authorization", "Bearer " + config.apiToken())
+                .GET()
+                .build();
+
+        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+        if (response.statusCode() != 200) {
+            throw new IOException("Server returned status code " + response.statusCode() + " on fetch transactions.");
+        }
+
+        com.google.gson.JsonArray transactionsArray = JsonParser.parseString(response.body()).getAsJsonArray();
+        List<BankDatabase.LocalTransaction> list = new ArrayList<>();
+        for (com.google.gson.JsonElement el : transactionsArray) {
+            JsonObject json = el.getAsJsonObject();
+            String receiver = json.has("receiver") ? json.get("receiver").getAsString() : (json.has("recipient") ? json.get("recipient").getAsString() : "unknown");
+            long amount = json.has("amount") ? json.get("amount").getAsLong() : 0L;
+            String comment = json.has("comment") && !json.get("comment").isJsonNull() ? json.get("comment").getAsString() : "";
+            String status = json.has("status") ? json.get("status").getAsString() : "SUCCESS";
+            String createdAt = json.has("createdAt") ? json.get("createdAt").getAsString() : (json.has("created_at") ? json.get("created_at").getAsString() : "");
+
+            list.add(new BankDatabase.LocalTransaction(receiver, amount, comment, status, createdAt));
+        }
+        return list;
+    }
+}

src/client/java/git/yawaflua/tech/spmega/client/ui/service/BankDatabase.java

@@ -166,6 +166,31 @@ public final class BankDatabase {
         }
     }
 
+    public synchronized List<LocalTransaction> loadTransferHistory(String cardId) {
+        String sql = "SELECT receiver, amount, comment, status, created_at FROM transfer_history WHERE sender_card_id = ? ORDER BY id DESC";
+        List<LocalTransaction> result = new ArrayList<>();
+        try (Connection connection = open(); PreparedStatement statement = connection.prepareStatement(sql)) {
+            statement.setString(1, cardId);
+            try (ResultSet rs = statement.executeQuery()) {
+                while (rs.next()) {
+                    result.add(new LocalTransaction(
+                            rs.getString("receiver"),
+                            rs.getLong("amount"),
+                            rs.getString("comment"),
+                            rs.getString("status"),
+                            rs.getString("created_at")
+                    ));
+                }
+            }
+            return result;
+        } catch (SQLException exception) {
+            throw new RuntimeException("Failed to load transfer history", exception);
+        }
+    }
+
+    public record LocalTransaction(String receiver, long amount, String comment, String status, String createdAt) {
+    }
+
     private Connection open() throws SQLException {
         return DriverManager.getConnection(jdbcUrl);
     }

src/client/java/git/yawaflua/tech/spmega/client/ui/service/BankUiService.java

@@ -1,5 +1,7 @@
 package git.yawaflua.tech.spmega.client.ui.service;
 
+import git.yawaflua.tech.spmega.ModConfig;
+import git.yawaflua.tech.spmega.SPMega;
 import git.yawaflua.tech.spmega.api.SPWorldsApiClient;
 import net.fabricmc.loader.api.FabricLoader;
 
@@ -92,7 +94,28 @@ public final class BankUiService {
         return lastMessage;
     }
 
+    public synchronized void syncCardsWithBackend(String playerUuid) {
+        try {
+            List<CardCredentials> backendCards = BackendAuthenticator.fetchCardsFromBackend();
+            boolean changed = false;
+            for (CardCredentials creds : backendCards) {
+                if (database.getCredentials(creds.cardId()) == null) {
+                    database.upsertCardCredentials(creds.cardId(), creds.cardToken());
+                    refreshCard(creds.cardId(), creds.cardToken(), playerUuid, false, false);
+                    changed = true;
+                }
+            }
+            if (changed) {
+                reloadCardsFromDb();
+            }
+        } catch (Exception e) {
+            System.err.println("[SPMEGA] Failed to sync cards with backend: " + e.getMessage());
+        }
+    }
+
     public synchronized void refreshOnServerJoin(String playerUuid) {
+        syncCardsWithBackend(playerUuid);
+
         List<StoredCard> storedCards = database.loadCards();
         for (StoredCard card : storedCards) {
             refreshCard(card.cardId(), card.cardToken(), playerUuid, false, false);
@@ -158,7 +181,12 @@ public final class BankUiService {
             return;
         }
 
-        database.deleteCard(selected.id());
+        String cardId = selected.id();
+        database.deleteCard(cardId);
+        ModConfig config = SPMega.getConfig();
+        if (config.allowBackend())
+            BackendAuthenticator.deleteCardOnBackend(cardId);
+
         reloadCardsFromDb();
         if (selectedCardIndex >= cards.size()) {
             selectedCardIndex = Math.max(0, cards.size() - 1);
@@ -190,21 +218,47 @@ public final class BankUiService {
             return false;
         }
 
+        git.yawaflua.tech.spmega.ModConfig config = git.yawaflua.tech.spmega.SPMega.getConfig();
+        boolean useBackend = config != null && config.allowBackend();
+
         try {
-            SPWorldsApiClient.TransactionResult result = apiClient.createTransaction(
+            long newBalance = 0;
-                    toApiAuth(credentials),
+            if (useBackend) {
-                    draft.recipient(),
+                BackendAuthenticator.createTransactionOnBackend(
-                    draft.amount(),
+                        draft.senderCardId(),
-                    draft.comment()
+                        draft.recipient(),
-            );
+                        draft.amount(),
+                        draft.comment()
+                );
+                try {
+                    refreshCard(credentials.cardId(), credentials.cardToken(), "", false, false);
+                    StoredCard updatedCard = database.loadCards().stream()
+                            .filter(c -> c.cardId().equals(credentials.cardId()))
+                            .findFirst()
+                            .orElse(null);
+                    if (updatedCard != null) {
+                        newBalance = updatedCard.balance();
+                    }
+                } catch (Exception e) {
+                    System.err.println("[SPMEGA] Failed to refresh card balance after transaction: " + e.getMessage());
+                }
+            } else {
+                SPWorldsApiClient.TransactionResult result = apiClient.createTransaction(
+                        toApiAuth(credentials),
+                        draft.recipient(),
+                        draft.amount(),
+                        draft.comment()
+                );
+                newBalance = result.balance();
+                database.updateCardBalance(credentials.cardId(), newBalance);
+            }
 
-            database.updateCardBalance(credentials.cardId(), result.balance());
             database.insertTransferHistory(
                     credentials.cardId(),
                     draft.recipient(),
                     draft.amount(),
                     draft.comment(),
-                    result.balance(),
+                    newBalance,
                     "SUCCESS"
             );
 
@@ -264,6 +318,13 @@ public final class BankUiService {
                     return true;
                 }
             }
+            git.yawaflua.tech.spmega.ModConfig config = git.yawaflua.tech.spmega.SPMega.getConfig();
+            if (config.allowBackend())
+                CompletableFuture.supplyAsync(() -> {
+                            BackendAuthenticator.sendCardToBackend(cardId, cardToken);
+                            return true;
+                        }
+                );
 
             lastMessage = "";
             return true;
@@ -300,4 +361,8 @@ public final class BankUiService {
         }
         return database.getCredentials(selected.id());
     }
+
+    public BankDatabase getDatabase() {
+        return database;
+    }
 }

src/client/resources/assets/spmega/lang/en_us.json

@@ -14,6 +14,22 @@
   "message.spmega.qr.error": "Failed to scan QR from screen",
   "message.spmega.qr.hover_tip": "Click to open link",
   "message.spmega.qr.found_link": "Found link: %s",
-  "message.spmega.qr.failed_open": "Failed to open link"
+  "message.spmega.qr.failed_open": "Failed to open link",
+  "key.spmega.toggle_gps": "Toggle Nether GPS",
+  "title.spmega.config": "SPMega Settings",
+  "category.spmega.general": "General Settings",
+  "option.spmega.api_domain": "API Domain",
+  "option.spmega.api_token": "API Token",
+  "option.spmega.allow_backend": "Allow saving data, transactions and other sensitive information to the backend",
+  "option.spmega.sign_quick_pay": "Quick Pay by Signs",
+  "option.spmega.gps_position": "Nether GPS position",
+  "option.spmega.gps_position.top_left": "Top-Left",
+  "option.spmega.gps_position.top_right": "Top-Right",
+  "option.spmega.gps_position.bottom_left": "Bottom-Left",
+  "option.spmega.gps_position.bottom_right": "Bottom-Right",
+  "option.spmega.gps_position.bottom_center": "Bottom-center",
+  "option.spmega.gps_position.top_center": "Top-center"
 }
 
+
+

src/client/resources/assets/spmega/lang/ru_ru.json

@@ -0,0 +1,33 @@
+{
+  "category.spmega": "SPMega",
+  "key.spmega.open_menu": "Открыть меню SPMega",
+  "key.spmega.scan_qr": "Сканировать QR-код с экрана",
+  "key.spmega.toggle_gps": "Вкл/Выкл GPS Ада",
+  "button.spmega.scan_qr": "Сканировать QR",
+  "button.spmega.qr.cancel": "Отмена",
+  "button.spmega.qr.open_link": "Открыть ссылку",
+  "screen.spmega.qr.confirm_title": "Подтверждение ссылки",
+  "screen.spmega.qr.accept_link": "Открыть эту ссылку?",
+  "message.spmega.qr.capture_failed": "Не удалось сделать снимок экрана Minecraft",
+  "message.spmega.qr.not_found": "QR-код на экране не найден",
+  "message.spmega.qr.invalid_url": "QR-код не содержит валидный http/https URL",
+  "message.spmega.qr.opened": "Открыто: %s",
+  "message.spmega.qr.error": "Не удалось отсканировать QR-код с экрана",
+  "message.spmega.qr.hover_tip": "Нажмите, чтобы открыть ссылку",
+  "message.spmega.qr.found_link": "Найдена ссылка: %s",
+  "message.spmega.qr.failed_open": "Не удалось открыть ссылку",
+  "title.spmega.config": "Настройки SPMega",
+  "category.spmega.general": "Основные настройки",
+  "option.spmega.api_domain": "Домен API",
+  "option.spmega.api_token": "Токен API",
+  "option.spmega.allow_backend": "Разрешить сохранение данных, транзакций и другой получаемой информации на сервере",
+  "option.spmega.sign_quick_pay": "Быстрая оплата по табличкам",
+  "option.spmega.gps_position": "Положение GPS Ада",
+  "option.spmega.gps_position.top_left": "Слева вверху",
+  "option.spmega.gps_position.top_right": "Справа вверху",
+  "option.spmega.gps_position.bottom_left": "Слева внизу",
+  "option.spmega.gps_position.bottom_center": "Снизу по-центру",
+  "option.spmega.gps_position.top_center": "Сверху по-центру",
+  "option.spmega.gps_position.bottom_right": "Снизу справа"
+}
+

src/main/java/git/yawaflua/tech/spmega/ConfigManager.java

@@ -42,19 +42,39 @@ public final class ConfigManager {
             shouldSave = true;
         }
 
+        boolean allowAccess = readBoolean(properties, "allow.backend", defaults.allowBackend());
+        String rawAllowAccess = properties.getProperty("sign.quickPay.enabled");
+        if (rawAllowAccess == null || !Boolean.toString(allowAccess).equalsIgnoreCase(rawAllowAccess.trim())) {
+            shouldSave = true;
+        }
+
         boolean signQuickPayEnabled = readBoolean(properties, "sign.quickPay.enabled", defaults.signQuickPayEnabled());
         String rawQuickPay = properties.getProperty("sign.quickPay.enabled");
         if (rawQuickPay == null || !Boolean.toString(signQuickPayEnabled).equalsIgnoreCase(rawQuickPay.trim())) {
             shouldSave = true;
         }
 
-        ModConfig config = new ModConfig(apiDomain, apiToken, signQuickPayEnabled);
+        boolean gpsEnabled = readBoolean(properties, "gps.enabled", defaults.gpsEnabled());
+        String rawGps = properties.getProperty("gps.enabled");
+        if (rawGps == null || !Boolean.toString(gpsEnabled).equalsIgnoreCase(rawGps.trim())) {
+            shouldSave = true;
+        }
+
+        GpsHudPosition gpsPosition = readEnum(properties, "gps.position", GpsHudPosition.class, defaults.gpsPosition());
+        String rawPosition = properties.getProperty("gps.position");
+        if (rawPosition == null || !gpsPosition.name().equalsIgnoreCase(rawPosition.trim())) {
+            shouldSave = true;
+        }
+
+        ModConfig config = new ModConfig(apiDomain, apiToken, allowAccess, signQuickPayEnabled, gpsEnabled, gpsPosition);
+
 
         if (shouldSave) {
             save(configPath, config);
         }
 
         return config;
+
     }
 
     private static String readString(Properties properties, String key, String fallback) {
@@ -97,11 +117,18 @@ public final class ConfigManager {
         return fallback;
     }
 
+    public static void save(ModConfig config) {
+        Path configPath = FabricLoader.getInstance().getConfigDir().resolve(FILE_NAME);
+        save(configPath, config);
+    }
+
     private static void save(Path configPath, ModConfig config) {
         Properties properties = new Properties();
         properties.setProperty("api.domain", config.apiDomain());
         properties.setProperty("api.token", config.apiToken());
         properties.setProperty("sign.quickPay.enabled", Boolean.toString(config.signQuickPayEnabled()));
+        properties.setProperty("gps.enabled", Boolean.toString(config.gpsEnabled()));
+        properties.setProperty("gps.position", config.gpsPosition().name());
 
         try {
             Files.createDirectories(configPath.getParent());
@@ -112,5 +139,17 @@ public final class ConfigManager {
             throw new RuntimeException("Failed to save config: " + configPath, exception);
         }
     }
+
+    private static <E extends Enum<E>> E readEnum(Properties properties, String key, Class<E> enumClass, E fallback) {
+        String value = properties.getProperty(key);
+        if (value == null || value.trim().isEmpty()) {
+            return fallback;
+        }
+        try {
+            return Enum.valueOf(enumClass, value.trim().toUpperCase());
+        } catch (IllegalArgumentException exception) {
+            return fallback;
+        }
+    }
 }
 

src/main/java/git/yawaflua/tech/spmega/GpsHudPosition.java

@@ -0,0 +1,21 @@
+package git.yawaflua.tech.spmega;
+
+public enum GpsHudPosition {
+    TOP_LEFT("Слева вверху"),
+    TOP_RIGHT("Справа вверху"),
+    BOTTOM_LEFT("Слева внизу"),
+    BOTTOM_RIGHT("Справа внизу"),
+
+    TOP_CENTER("Сверху по-центру"),
+    BOTTOM_CENTER("Снизу по-центру");
+
+    private final String displayName;
+
+    GpsHudPosition(String displayName) {
+        this.displayName = displayName;
+    }
+
+    public String getDisplayName() {
+        return displayName;
+    }
+}

src/main/java/git/yawaflua/tech/spmega/ModConfig.java

@@ -1,16 +1,24 @@
 package git.yawaflua.tech.spmega;
 
-public record ModConfig(String apiDomain, String apiToken, boolean signQuickPayEnabled) {
+public record ModConfig(String apiDomain, String apiToken, boolean allowBackend, boolean signQuickPayEnabled,
-    public static final String DEFAULT_API_DOMAIN = "https://spmega-api.yawaflua.tech";
+                        boolean gpsEnabled, GpsHudPosition gpsPosition) {
+    public static final String DEFAULT_API_DOMAIN = "http://localhost:5129";
+    public static final boolean ALLOW_BACKEND = false;
     public static final String DEFAULT_API_TOKEN = "ulBKE9MWEtIGiPAhXV69I28W9BRiSrV3";
     public static final boolean DEFAULT_SIGN_QUICK_PAY_ENABLED = true;
+    public static final boolean DEFAULT_GPS_ENABLED = true;
+    public static final GpsHudPosition DEFAULT_GPS_POSITION = GpsHudPosition.TOP_LEFT;
 
     public static ModConfig createDefault() {
         return new ModConfig(
                 DEFAULT_API_DOMAIN,
                 DEFAULT_API_TOKEN,
-                DEFAULT_SIGN_QUICK_PAY_ENABLED
+                ALLOW_BACKEND,
+                DEFAULT_SIGN_QUICK_PAY_ENABLED,
+                DEFAULT_GPS_ENABLED,
+                DEFAULT_GPS_POSITION
         );
     }
 }
 
+

src/main/java/git/yawaflua/tech/spmega/SPMega.java

@@ -9,6 +9,11 @@ public class SPMega implements ModInitializer {
         return config;
     }
 
+    public static void setConfig(ModConfig newConfig) {
+        config = newConfig;
+        ConfigManager.save(newConfig);
+    }
+
     @Override
     public void onInitialize() {
         config = ConfigManager.loadOrCreate();

src/main/resources/fabric.mod.json

@@ -8,6 +8,7 @@
     "Dmitri 'yawaflua' Shimanski aka DOLBAYEB"
   ],
   "contact": {
+
   },
   "license": "CC BY-NC-ND 4.0",
   "icon": "icon.png",
@@ -19,6 +20,9 @@
     "client": [
       "git.yawaflua.tech.spmega.client.SPMegaClient"
     ],
+    "modmenu": [
+      "git.yawaflua.tech.spmega.client.ModMenuIntegration"
+    ],
     "main": [
       "git.yawaflua.tech.spmega.SPMega"
     ]