diff --git a/mnemo_cards_backend/lib/api/v2/purchases_api_v2.dart b/mnemo_cards_backend/lib/api/v2/purchases_api_v2.dart
index e5c9dd1..3d67204 100644
--- a/mnemo_cards_backend/lib/api/v2/purchases_api_v2.dart
+++ b/mnemo_cards_backend/lib/api/v2/purchases_api_v2.dart
@@ -63,6 +63,15 @@ class PurchasesApiV2 {
     headers: {'Content-Type': 'application/json'},
   );
 
+  Response _forbidden(String message) => Response(
+    403,
+    body: jsonEncode({
+      'error': 'Forbidden',
+      'message': message,
+    }),
+    headers: {'Content-Type': 'application/json'},
+  );
+
   Response _notFound([String? message]) => Response.notFound(
     jsonEncode({
       'error': 'Not Found',
@@ -430,5 +439,79 @@ class PurchasesApiV2 {
     }
   }
 
+  /// POST /api/v2/purchases/check-payment/{paymentId}
+  /// Force check payment status and process if succeeded
+  /// This endpoint allows frontend to trigger immediate payment verification
+  /// instead of waiting for the cron job (which runs every 5 minutes)
+  @Route.post('/purchases/check-payment/<paymentId>')
+  @OpenApiRouteHttp()
+  Future<Response> checkPayment(Request request, String paymentId) async {
+    try {
+      final user = request.user;
+      if (user == null || user.id == null) {
+        return _unauthorized();
+      }
+
+      developer.log(
+        'Manual payment check requested: paymentId=$paymentId, userId=${user.id}',
+        name: 'PurchasesApiV2',
+      );
+
+      // Find payment by external token (YooKassa payment ID)
+      final payment = await _db.paymentDao.getPaymentByExternalToken(paymentId);
+      
+      if (payment == null) {
+        developer.log(
+          'Payment not found: $paymentId',
+          name: 'PurchasesApiV2',
+        );
+        return _notFound('Payment not found');
+      }
+
+      // Verify payment belongs to current user
+      if (payment.userId != user.id) {
+        developer.log(
+          'Payment access denied: paymentId=$paymentId, ownerId=${payment.userId}, requesterId=${user.id}',
+          name: 'PurchasesApiV2',
+        );
+        return _forbidden('Access denied');
+      }
+
+      developer.log(
+        'Checking payment status: paymentId=$paymentId, currentStatus=${payment.status}',
+        name: 'PurchasesApiV2',
+      );
+
+      // Force check and process payment
+      await _paymentManager.checkAndProcessPayment(payment);
+
+      // Get updated payment status
+      final updatedPayment =
+          await _db.paymentDao.getPaymentByExternalToken(paymentId);
+
+      final finalStatus = updatedPayment?.status ?? payment.status;
+      
+      developer.log(
+        'Payment check completed: paymentId=$paymentId, finalStatus=$finalStatus',
+        name: 'PurchasesApiV2',
+      );
+
+      return _ok({
+        'paymentId': paymentId,
+        'status': finalStatus,
+        'checked': true,
+        'timestamp': DateTime.now().toIso8601String(),
+      });
+    } catch (e, s) {
+      developer.log(
+        'Error checking payment: $e',
+        error: e,
+        stackTrace: s,
+        name: 'PurchasesApiV2',
+      );
+      return _internalServerError(e.toString());
+    }
+  }
+
   Router get router => _$PurchasesApiV2Router(this);
 }
diff --git a/mnemo_cards_web_v2/lib/domain/config/api_config_v2.dart b/mnemo_cards_web_v2/lib/domain/config/api_config_v2.dart
index bd2b954..3ebd05d 100644
--- a/mnemo_cards_web_v2/lib/domain/config/api_config_v2.dart
+++ b/mnemo_cards_web_v2/lib/domain/config/api_config_v2.dart
@@ -204,6 +204,11 @@ class ApiConfigV2 {
   static String purchasesPaymentVerify(String paymentId) =>
       '/purchases/payments/$paymentId/verify';
 
+  /// POST /api/v2/purchases/check-payment/{paymentId}
+  /// Force check payment status and process if succeeded
+  static String purchasesCheckPayment(String paymentId) =>
+      '/purchases/check-payment/$paymentId';
+
   // ==================== Subscriptions Endpoints ====================
 
   /// GET /api/v2/subscriptions/plans
diff --git a/mnemo_cards_web_v2/lib/domain/models/purchase_models.dart b/mnemo_cards_web_v2/lib/domain/models/purchase_models.dart
index da975d0..7c0c078 100644
--- a/mnemo_cards_web_v2/lib/domain/models/purchase_models.dart
+++ b/mnemo_cards_web_v2/lib/domain/models/purchase_models.dart
@@ -7,15 +7,17 @@ class PackPurchaseStatus {
     required this.isPurchased,
     required this.purchased,
     required this.hasSubscriptionAccess,
+    this.isAvailable,
   });
 
   final String packId;
   final bool isPurchased;
   final bool purchased;
   final bool hasSubscriptionAccess;
+  final bool? isAvailable;
 
   /// Whether the user can access the pack either via purchase or subscription.
-  bool get canAccess => isPurchased || hasSubscriptionAccess;
+  bool get canAccess => isAvailable ?? (isPurchased || hasSubscriptionAccess);
 
   factory PackPurchaseStatus.fromJson(Map<String, dynamic> json) {
     return PackPurchaseStatus(
@@ -23,6 +25,7 @@ class PackPurchaseStatus {
       isPurchased: json['isPurchased'] as bool? ?? false,
       purchased: json['purchased'] as bool? ?? false,
       hasSubscriptionAccess: json['hasSubscriptionAccess'] as bool? ?? false,
+      isAvailable: json['isAvailable'] as bool?,
     );
   }
 
@@ -32,6 +35,7 @@ class PackPurchaseStatus {
       'isPurchased': isPurchased,
       'purchased': purchased,
       'hasSubscriptionAccess': hasSubscriptionAccess,
+      if (isAvailable != null) 'isAvailable': isAvailable,
     };
   }
 }
diff --git a/mnemo_cards_web_v2/lib/domain/services/http_repository_v2.dart b/mnemo_cards_web_v2/lib/domain/services/http_repository_v2.dart
index c1c9685..c8a0454 100644
--- a/mnemo_cards_web_v2/lib/domain/services/http_repository_v2.dart
+++ b/mnemo_cards_web_v2/lib/domain/services/http_repository_v2.dart
@@ -1285,6 +1285,48 @@ class HttpRepositoryV2 {
     }
   }
 
+  /// Force check payment status on backend.
+  /// Triggers immediate payment verification instead of waiting for cron job.
+  /// Returns the updated payment status.
+  Future<Map<String, dynamic>> checkPayment(String paymentId) async {
+    try {
+      // Extract actual payment ID in case a full URL was passed
+      final actualPaymentId = _extractPaymentId(paymentId);
+      
+      log(
+        'Forcing payment check: paymentId=$actualPaymentId',
+        name: 'HttpRepositoryV2',
+      );
+      
+      final response = await _dio.post<Map<String, dynamic>>(
+        ApiConfigV2.purchasesCheckPayment(actualPaymentId),
+      );
+      
+      final data = response.data ?? const <String, dynamic>{};
+      
+      log(
+        'Payment check response: status=${data['status']}, checked=${data['checked']}',
+        name: 'HttpRepositoryV2',
+      );
+      
+      return data;
+    } on DioException catch (e) {
+      log(
+        'Error checking payment: ${e.message}',
+        error: e,
+        name: 'HttpRepositoryV2',
+      );
+      
+      if (e.error is ApiException) {
+        rethrow;
+      }
+      throw NetworkException(
+        message: e.message ?? 'Network error',
+        originalError: e,
+      );
+    }
+  }
+
   /// Fetch processed purchases for the current user.
   Future<List<PaymentDto>> getUserPurchases() async {
     try {
diff --git a/mnemo_cards_web_v2/lib/domain/services/pending_purchase_checker.dart b/mnemo_cards_web_v2/lib/domain/services/pending_purchase_checker.dart
new file mode 100644
index 0000000..892df39
--- /dev/null
+++ b/mnemo_cards_web_v2/lib/domain/services/pending_purchase_checker.dart
@@ -0,0 +1,132 @@
+import 'dart:async';
+import 'dart:developer';
+
+import 'package:mnemo_cards_common/mnemo_cards_common.dart';
+
+import 'http_repository_v2.dart';
+
+/// Service for checking pending purchases
+///
+/// Automatically polls the backend to check if a pack that requires purchase
+/// has become available (after payment is processed).
+///
+/// Usage:
+/// ```dart
+/// final checker = PendingPurchaseChecker(httpRepository: repository);
+/// checker.startCheckingPackAccess(packId, lastPaymentId).listen((response) {
+///   if (response is CardPackDto) {
+///     // Access granted!
+///   }
+/// });
+/// ```
+class PendingPurchaseChecker {
+  final HttpRepositoryV2 httpRepository;
+
+  PendingPurchaseChecker({required this.httpRepository});
+
+  /// Start checking pack access status periodically
+  ///
+  /// [packId] - ID of the pack to check
+  /// [lastPaymentId] - Optional payment ID for force-checking payment status
+  ///
+  /// Returns a stream of pack responses. When pack becomes available,
+  /// emits CardPackDto and stops checking.
+  ///
+  /// Checks every 3 seconds for up to 20 attempts (1 minute total).
+  /// First attempt uses checkPayment endpoint if paymentId provided.
+  Stream<GetCardPackResponse> startCheckingPackAccess(
+    String packId, {
+    String? lastPaymentId,
+  }) {
+    return _checkPackAccessPeriodically(packId, lastPaymentId: lastPaymentId);
+  }
+
+  Stream<GetCardPackResponse> _checkPackAccessPeriodically(
+    String packId, {
+    String? lastPaymentId,
+  }) async* {
+    const maxAttempts = 20;
+    const checkInterval = Duration(seconds: 3);
+    var attemptCount = 0;
+
+    log(
+      'Starting periodic pack access check: packId=$packId, paymentId=$lastPaymentId',
+      name: 'PendingPurchaseChecker',
+    );
+
+    // First attempt: force-check payment if paymentId is provided
+    if (lastPaymentId != null && lastPaymentId.isNotEmpty) {
+      try {
+        log(
+          'Attempt 1: Force-checking payment status',
+          name: 'PendingPurchaseChecker',
+        );
+        await httpRepository.checkPayment(lastPaymentId);
+        
+        // Small delay to let backend process
+        await Future<void>.delayed(const Duration(milliseconds: 500));
+      } catch (e) {
+        log(
+          'Error force-checking payment: $e',
+          error: e,
+          name: 'PendingPurchaseChecker',
+        );
+        // Continue with regular polling even if force-check fails
+      }
+    }
+
+    // Regular polling loop
+    while (attemptCount < maxAttempts) {
+      attemptCount++;
+
+      try {
+        log(
+          'Attempt $attemptCount/$maxAttempts: Checking pack access',
+          name: 'PendingPurchaseChecker',
+        );
+
+        final response = await httpRepository.getPack(packId);
+
+        // Check response type to see if access is granted
+        if (response.responseType == GetCardPackResponseType.dto) {
+          // Access granted! Return CardPackDto
+          log(
+            'Pack access granted! Stopping check.',
+            name: 'PendingPurchaseChecker',
+          );
+          yield response;
+          return; // Stop checking
+        } else {
+          // Still requires purchase (CardPackBuyDto) - keep checking
+          log(
+            'Pack still requires purchase (type=${response.responseType.name}), continuing...',
+            name: 'PendingPurchaseChecker',
+          );
+        }
+
+        // Don't yield if still requires purchase - only yield when access granted
+        // This prevents unnecessary UI updates
+
+      } catch (e, s) {
+        log(
+          'Error checking pack access (attempt $attemptCount)',
+          error: e,
+          stackTrace: s,
+          name: 'PendingPurchaseChecker',
+        );
+        // Continue checking even on error
+      }
+
+      // Wait before next attempt (unless this was the last attempt)
+      if (attemptCount < maxAttempts) {
+        await Future<void>.delayed(checkInterval);
+      }
+    }
+
+    log(
+      'Reached max attempts ($maxAttempts) without pack access. Stopping check.',
+      name: 'PendingPurchaseChecker',
+    );
+  }
+}
+
diff --git a/mnemo_cards_web_v2/lib/presentation/pages/pack_details/pack_details_page.dart b/mnemo_cards_web_v2/lib/presentation/pages/pack_details/pack_details_page.dart
index 901b83b..7949f1b 100644
--- a/mnemo_cards_web_v2/lib/presentation/pages/pack_details/pack_details_page.dart
+++ b/mnemo_cards_web_v2/lib/presentation/pages/pack_details/pack_details_page.dart
@@ -9,6 +9,7 @@ import 'package:yx_scope_flutter/yx_scope_flutter.dart';
 
 import '../../../di/app_scope/app_scope_container.dart';
 import '../../../domain/events/purchase_event_broadcaster.dart';
+import '../../../domain/services/pending_purchase_checker.dart';
 import '../../../presentation/theme/app_colors.dart';
 import '../../../presentation/widgets/pack_card_item.dart';
 import '../../../presentation/widgets/pack_details_header.dart';
@@ -54,6 +55,7 @@ class _PackDetailsPageState extends State<PackDetailsPage> {
   int _lastAnimatedShuffleKey = 0;
   bool _isNavigatingToPurchase = false;
   StreamSubscription<PurchaseEvent>? _purchaseEventSubscription;
+  StreamSubscription<GetCardPackResponse>? _pendingPurchaseSubscription;
 
   @override
   void initState() {
@@ -62,11 +64,33 @@ class _PackDetailsPageState extends State<PackDetailsPage> {
     _loadTests();
     _loadPackProgress();
     _subscribeToPurchaseEvents();
+
+    // Проверить query параметр для принудительной перезагрузки
+    // Это дополнительная страховка на случай, если событие не дошло
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      final uri = GoRouterState.of(context).uri;
+      final justPurchased = uri.queryParameters['justPurchased'] == 'true';
+
+      if (justPurchased) {
+        // Небольшая задержка для гарантии, что событие успело отправиться
+        Future.delayed(const Duration(milliseconds: 500), () {
+          if (mounted) {
+            log(
+              'Just purchased flag detected, reloading pack data',
+              name: 'PackDetailsPage',
+            );
+            _loadPack();
+            _loadPackProgress();
+          }
+        });
+      }
+    });
   }
 
   @override
   void dispose() {
     _purchaseEventSubscription?.cancel();
+    _stopPendingPurchaseCheck();
     super.dispose();
   }
 
@@ -92,9 +116,10 @@ class _PackDetailsPageState extends State<PackDetailsPage> {
         if (event.packId == widget.packId &&
             event.type == PurchaseEventType.completed) {
           log(
-            'Purchase completed for pack ${widget.packId}, reloading data',
+            'Purchase completed event received for pack ${widget.packId}, reloading data',
             name: 'PackDetailsPage',
           );
+          // Перезагрузить данные (доступ уже подтвержден на backend)
           _loadPack();
           _loadPackProgress();
         }
@@ -134,6 +159,14 @@ class _PackDetailsPageState extends State<PackDetailsPage> {
           _packResponse = packResponse;
           _isLoading = false;
         });
+
+        // If pack requires purchase, start checking for access
+        if (packResponse is CardPackBuyDto) {
+          _startPendingPurchaseCheck();
+        } else {
+          // Pack is accessible, stop any ongoing check
+          _stopPendingPurchaseCheck();
+        }
       }
     } catch (e, s) {
       log(
@@ -1105,5 +1138,105 @@ class _PackDetailsPageState extends State<PackDetailsPage> {
     }
   }
 
+  /// Start checking for pending purchase completion
+  Future<void> _startPendingPurchaseCheck() async {
+    _stopPendingPurchaseCheck();
+
+    final appScope = ScopeProvider.of<AppScopeContainer>(
+      context,
+      listen: false,
+    );
+
+    if (appScope == null) {
+      log(
+        'Cannot start pending purchase check: app scope not available',
+        name: 'PackDetailsPage',
+      );
+      return;
+    }
+
+    log(
+      'Starting pending purchase check for pack ${widget.packId}',
+      name: 'PackDetailsPage',
+    );
+
+    // Create checker and start monitoring
+    final checker = PendingPurchaseChecker(
+      httpRepository: appScope.httpRepository,
+    );
+
+    _pendingPurchaseSubscription = checker
+        .startCheckingPackAccess(
+      widget.packId,
+      lastPaymentId: null, // Could get from purchase history if available
+    )
+        .listen(
+      (response) {
+        if (!mounted) return;
+
+        // Access granted!
+        log(
+          'Pending purchase completed for pack ${widget.packId}',
+          name: 'PackDetailsPage',
+        );
+
+        _handleAccessGranted();
+      },
+      onError: (Object error, StackTrace stackTrace) {
+        log(
+          'Error in pending purchase check',
+          error: error,
+          stackTrace: stackTrace,
+          name: 'PackDetailsPage',
+        );
+      },
+      onDone: () {
+        log(
+          'Pending purchase check completed',
+          name: 'PackDetailsPage',
+        );
+        _stopPendingPurchaseCheck();
+      },
+    );
+  }
+
+  /// Stop checking for pending purchase
+  void _stopPendingPurchaseCheck() {
+    _pendingPurchaseSubscription?.cancel();
+    _pendingPurchaseSubscription = null;
+  }
+
+  /// Handle access granted after purchase
+  void _handleAccessGranted() {
+    final appScope = ScopeProvider.of<AppScopeContainer>(
+      context,
+      listen: false,
+    );
+    final userScope = appScope?.userScopeHolder.scope;
+
+    // Send event
+    if (userScope != null) {
+      userScope.purchaseEventBroadcaster.onPurchaseCompleted(
+        packId: widget.packId,
+        paymentId: 'auto-detected',
+      );
+    }
+
+    // Show success message
+    if (mounted) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('Покупка подтверждена! 🎉'),
+          backgroundColor: Colors.green,
+          duration: Duration(seconds: 3),
+        ),
+      );
+
+      // Reload pack data
+      _loadPack();
+      _loadPackProgress();
+    }
+  }
+
   // Старые методы управления удалены - заменены PackDetailsControls
 }
diff --git a/mnemo_cards_web_v2/lib/presentation/pages/payment_return/payment_return_page.dart b/mnemo_cards_web_v2/lib/presentation/pages/payment_return/payment_return_page.dart
index 697f0b6..44e199c 100644
--- a/mnemo_cards_web_v2/lib/presentation/pages/payment_return/payment_return_page.dart
+++ b/mnemo_cards_web_v2/lib/presentation/pages/payment_return/payment_return_page.dart
@@ -90,33 +90,101 @@ class _PaymentReturnPageState extends State<PaymentReturnPage> {
 
       if (result.isSuccess) {
         log(
-          'Payment verified successfully, emitting event',
+          'Payment verified successfully, checking pack access',
           name: 'PaymentReturnPage',
         );
 
-        // Отправить событие о завершении покупки
-        userScope.purchaseEventBroadcaster.onPurchaseCompleted(
-          packId: packId,
-          paymentId: paymentId,
-        );
+        // Проверить, что backend выдал доступ к паку
+        // Используем retry логику, так как processPayment может выполняться асинхронно
+        bool accessGranted = false;
+        int retryCount = 0;
+        const maxRetries = 10; // Увеличено с 5 до 10
+        
+        // Сократить задержку для первых попыток
+        Duration getRetryDelay(int attempt) {
+          if (attempt < 3) {
+            return const Duration(milliseconds: 500); // Быстрые первые попытки
+          }
+          return const Duration(seconds: 1); // Стандартная задержка
+        }
 
-        // Показать успешное сообщение
-        ScaffoldMessenger.of(context).showSnackBar(
-          const SnackBar(
-            content: Text('Покупка успешно завершена! 🎉'),
-            backgroundColor: Colors.green,
-            duration: Duration(seconds: 2),
-          ),
-        );
+        while (!accessGranted && retryCount < maxRetries) {
+          if (retryCount > 0) {
+            await Future<void>.delayed(getRetryDelay(retryCount));
+          }
 
-        // Небольшая задержка для показа сообщения
-        await Future<void>.delayed(const Duration(milliseconds: 500));
+          if (!mounted) return;
+
+          try {
+            final status =
+                await userScope.purchasesService.getPackPurchaseStatus(packId);
+            accessGranted = status.isAvailable ?? status.canAccess;
+
+            if (accessGranted) {
+              log(
+                'Pack access confirmed after ${retryCount + 1} attempt(s)',
+                name: 'PaymentReturnPage',
+              );
+              break;
+            } else {
+              log(
+                'Pack access not yet granted, retrying... (${retryCount + 1}/$maxRetries)',
+                name: 'PaymentReturnPage',
+              );
+            }
+          } catch (e) {
+            log(
+              'Error checking pack access: $e',
+              name: 'PaymentReturnPage',
+            );
+          }
+
+          retryCount++;
+        }
 
         if (!mounted) return;
 
-        // Перенаправить на страницу пака
-        log('Redirecting to pack: $packId', name: 'PaymentReturnPage');
-        context.go('/pack/$packId');
+        if (accessGranted) {
+          // Только после подтверждения доступа отправляем событие
+          log(
+            'Pack access confirmed, emitting purchase completed event',
+            name: 'PaymentReturnPage',
+          );
+          userScope.purchaseEventBroadcaster.onPurchaseCompleted(
+            packId: packId,
+            paymentId: paymentId,
+          );
+
+          // Показать успешное сообщение
+          ScaffoldMessenger.of(context).showSnackBar(
+            const SnackBar(
+              content: Text('Покупка успешно завершена! 🎉'),
+              backgroundColor: Colors.green,
+              duration: Duration(seconds: 2),
+            ),
+          );
+
+          // Небольшая задержка для показа сообщения
+          await Future<void>.delayed(const Duration(milliseconds: 500));
+
+          if (!mounted) return;
+
+          // Перенаправить на страницу пака с флагом покупки
+          log('Redirecting to pack: $packId', name: 'PaymentReturnPage');
+          context.go('/pack/$packId?justPurchased=true');
+        } else {
+          // Если доступ не выдан после всех попыток, показываем сообщение
+          log(
+            'Pack access not granted after $maxRetries attempts',
+            name: 'PaymentReturnPage',
+          );
+          setState(() {
+            _errorMessage =
+                'Платеж подтвержден, но доступ к паку еще не выдан. Пожалуйста, подождите несколько минут и проверьте доступ к паку позже.';
+            _isVerifying = false;
+          });
+          return;
+        }
       } else {
         // Платеж не подтвержден
         log(
diff --git a/mnemo_cards_web_v2/test/domain/services/pending_purchase_checker_test.dart b/mnemo_cards_web_v2/test/domain/services/pending_purchase_checker_test.dart
new file mode 100644
index 0000000..8750380
--- /dev/null
+++ b/mnemo_cards_web_v2/test/domain/services/pending_purchase_checker_test.dart
@@ -0,0 +1,112 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:mnemo_cards_common/mnemo_cards_common.dart';
+import 'package:mnemo_cards_web_v2/domain/services/http_repository_v2.dart';
+import 'package:mnemo_cards_web_v2/domain/services/pending_purchase_checker.dart';
+
+class _MockHttpRepositoryV2 extends Mock implements HttpRepositoryV2 {}
+
+void main() {
+  late _MockHttpRepositoryV2 mockRepository;
+  late PendingPurchaseChecker checker;
+
+  setUp(() {
+    mockRepository = _MockHttpRepositoryV2();
+    checker = PendingPurchaseChecker(httpRepository: mockRepository);
+  });
+
+  group('PendingPurchaseChecker', () {
+    test('should emit CardPackDto when access is granted immediately', () async {
+      // Arrange
+      const packId = 'test-pack';
+      final cardPackDto = CardPackDto(
+        id: packId,
+        title: 'Test Pack',
+        subtitle: 'Test',
+        cards: const [],
+        color: null,
+        version: null,
+      );
+
+      when(() => mockRepository.checkPayment(any()))
+          .thenAnswer((_) async => <String, dynamic>{});
+      when(() => mockRepository.getPack(packId))
+          .thenAnswer((_) async => cardPackDto);
+
+      // Act
+      final stream = checker.startCheckingPackAccess(packId);
+
+      // Assert
+      await expectLater(
+        stream,
+        emits(isA<CardPackDto>()),
+      );
+
+      verify(() => mockRepository.getPack(packId)).called(1);
+    });
+
+    test('should call checkPayment when paymentId provided', () async {
+      // Arrange
+      const packId = 'test-pack';
+      const paymentId = 'payment-123';
+      final cardPackDto = CardPackDto(
+        id: packId,
+        title: 'Test Pack',
+        subtitle: 'Test',
+        cards: const [],
+        color: null,
+        version: null,
+      );
+
+      when(() => mockRepository.checkPayment(paymentId))
+          .thenAnswer((_) async => {'status': 'succeeded'});
+      when(() => mockRepository.getPack(packId))
+          .thenAnswer((_) async => cardPackDto);
+
+      // Act
+      final stream = checker.startCheckingPackAccess(
+        packId,
+        lastPaymentId: paymentId,
+      );
+
+      await stream.first;
+
+      // Assert
+      verify(() => mockRepository.checkPayment(paymentId)).called(1);
+    });
+
+    test('should handle errors gracefully and continue checking', () async {
+      // Arrange
+      const packId = 'test-pack';
+      final cardPackDto = CardPackDto(
+        id: packId,
+        title: 'Test Pack',
+        subtitle: 'Test',
+        cards: const [],
+        color: null,
+        version: null,
+      );
+
+      when(() => mockRepository.checkPayment(any()))
+          .thenAnswer((_) async => <String, dynamic>{});
+      
+      var callCount = 0;
+      when(() => mockRepository.getPack(packId)).thenAnswer((_) async {
+        callCount++;
+        if (callCount == 1) {
+          throw Exception('Network error');
+        }
+        return cardPackDto;
+      });
+
+      // Act
+      final stream = checker.startCheckingPackAccess(packId);
+
+      // Assert - should still succeed despite first error
+      await expectLater(
+        stream,
+        emits(isA<CardPackDto>()),
+      );
+    });
+  });
+}