diff --git a/backend/SpMega.Backend/Controllers/v1/TelemetryController.cs b/backend/SpMega.Backend/Controllers/v1/TelemetryController.cs
index acf7273..2689bd5 100644
--- a/backend/SpMega.Backend/Controllers/v1/TelemetryController.cs
+++ b/backend/SpMega.Backend/Controllers/v1/TelemetryController.cs
@@ -9,6 +9,7 @@ namespace SpMega.Backend.Controllers.v1;
 
 [ApiController]
 [Route("api/v1/telemetry")]
+[Authorize]
 public class TelemetryController : ControllerBase
 {
     private static readonly ActivitySource Source = new("SpMega.ModTelemetry");
diff --git a/backend/SpMega.Backend/Middleware/RequestTelemetryMiddleware.cs b/backend/SpMega.Backend/Middleware/RequestTelemetryMiddleware.cs
index ec1917b..f37094a 100644
--- a/backend/SpMega.Backend/Middleware/RequestTelemetryMiddleware.cs
+++ b/backend/SpMega.Backend/Middleware/RequestTelemetryMiddleware.cs
@@ -28,6 +28,7 @@ public class RequestTelemetryMiddleware(RequestDelegate next, ILogger<RequestTel
         activity?.SetTag("http.host", context.Request.Host.Value ?? string.Empty);
         activity?.SetTag("client.ip", context.Connection.RemoteIpAddress?.ToString());
         activity?.SetTag("http.user_agent", context.Request.Headers.UserAgent.ToString());
+        activity?.SetTag("http.headers", context.Request.Headers.ToString());
 
         var stopwatch = Stopwatch.StartNew();
         try
diff --git a/backend/SpMega.Backend/Persistent/Models/Users/Card.cs b/backend/SpMega.Backend/Persistent/Models/Users/Card.cs
index 19564f3..1094584 100644
--- a/backend/SpMega.Backend/Persistent/Models/Users/Card.cs
+++ b/backend/SpMega.Backend/Persistent/Models/Users/Card.cs
@@ -12,7 +12,7 @@ public class Card
     public string ShortId { get; set; } = "";
     public bool WebhookConnected { get; set; } = false;
 
-    public int Balance { get; set; } = 0;
+    public int? Balance { get; set; } = -1;
     
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
     public DateTime UpdatedAt { get; set; }