Add project files.

Controllers/OembedController.cs

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+using Microsoft.AspNetCore.Mvc;
+using System.Xml.Linq;
+
+namespace OembedTests.Controllers
+{
+    [Route("/oembed")]
+    [ApiController]
+    public class OembedController : ControllerBase
+    {
+        [HttpGet]
+        public async Task<IActionResult> GetOembed([FromQuery]string url, [FromQuery] string? format = "json")
+        {
+            var userName = url.Replace("https://oembed-test.yawaflua.ru/pay/", "");
+            var response = $@"{{
+	""version"": ""1.0"",
+	""type"": ""link"",
+	""provider_name"": ""SP-Donate"",
+	""provider_url"": ""https://sp-donate.ru/"",
+	""title"": ""Donate to {userName} right now!"",
+	""thumbnail_url"": ""https://avatar.spworlds.ru/front/240/{userName}""
+	}}";
+            return Ok(response);
+        }
+    }
+}

Controllers/WeatherForecastController.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace OembedTests.Controllers
+{
+    [ApiController]
+    [Route("pay")]
+    public class WeatherForecastController : ControllerBase
+    {
+        
+        [HttpGet("/{userName}")]
+        public async Task<IActionResult> Get(string userName)
+        {
+            return Ok(userName);
+        }
+    }
+}