fix(payment): send result redirects to the frontend + add /payment/result page

services/identity/FlatRender.IdentitySvc/Controllers/PaymentsController.cs

@@ -8,7 +8,7 @@ namespace FlatRender.IdentitySvc.Controllers;
 
 [ApiController]
 [Route("v1")]
-public class PaymentsController(IPaymentService paymentService) : ControllerBase
+public class PaymentsController(IPaymentService paymentService, IConfiguration config) : ControllerBase
 {
     // ── Helpers ───────────────────────────────────────────────────────────────────
 
@@ -19,6 +19,18 @@ public class PaymentsController(IPaymentService paymentService) : ControllerBase
 
     private bool IsAdmin => User.FindFirst("is_admin")?.Value == "true";
 
+    // Payment callbacks land on this service (api.flatrender.ir); the result page
+    // lives on the frontend. Prefix relative result paths with the frontend base so
+    // the browser is sent to the site, not the gateway.
+    private IActionResult RedirectFrontend(string path)
+    {
+        var baseUrl = config["Frontend:BaseUrl"] ?? "";
+        var target = string.IsNullOrEmpty(baseUrl) || path.StartsWith("http")
+            ? path
+            : baseUrl.TrimEnd('/') + path;
+        return Redirect(target);
+    }
+
     // ── Listing ───────────────────────────────────────────────────────────────────
 
     /// <summary>GET /v1/payments — list the caller's payment history</summary>
@@ -62,7 +74,7 @@ public class PaymentsController(IPaymentService paymentService) : ControllerBase
         [FromQuery] string Status)
     {
         var frontendUrl = await paymentService.HandleZarinPalCallbackAsync(Authority, Status);
-        return Redirect(frontendUrl);
+        return RedirectFrontend(frontendUrl);
     }
 
     // ── FlatRender Pay broker flow ────────────────────────────────────────────────
@@ -80,7 +92,7 @@ public class PaymentsController(IPaymentService paymentService) : ControllerBase
         [FromQuery] string? id)
     {
         var frontendUrl = await paymentService.HandleBrokerCallbackAsync(payment_id, id ?? "");
-        return Redirect(frontendUrl);
+        return RedirectFrontend(frontendUrl);
     }
 
     // ── SnapPay flow ──────────────────────────────────────────────────────────────
@@ -109,7 +121,7 @@ public class PaymentsController(IPaymentService paymentService) : ControllerBase
         [FromQuery] string shapSnapStatus)
     {
         var frontendUrl = await paymentService.HandleSnapPayCallbackAsync(paymentToken, shapSnapStatus);
-        return Redirect(frontendUrl);
+        return RedirectFrontend(frontendUrl);
     }
 
     // ── Tara flow ─────────────────────────────────────────────────────────────────
@@ -138,7 +150,7 @@ public class PaymentsController(IPaymentService paymentService) : ControllerBase
         [FromQuery] string status)
     {
         var frontendUrl = await paymentService.HandleTaraCallbackAsync(token, status);
-        return Redirect(frontendUrl);
+        return RedirectFrontend(frontendUrl);
     }
 
     // ── Stripe webhook ────────────────────────────────────────────────────────────