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mnemo_cards_backend/lib/api/v2/packs_api_v2.dart

@@ -150,6 +150,7 @@ class PacksApiV2 {
   }
 
   /// Generates presigned URL if value is a UUID (object ID), otherwise returns null
+  /// Presigned URLs now have 7 days expiration (configured in MinioConfig.presignedUrlExpirySeconds)
   Future<String?> _getPresignedUrlIfUuid(String? value, String bucket) async {
     if (value == null || value.isEmpty) return null;
     if (!_isValidUuid(value)) return null;
@@ -394,7 +395,8 @@ class PacksApiV2 {
         allVoices.addAll(voices);
       }
 
-      // Convert to DTOs and generate presigned URLs
+      // Convert to DTOs and generate presigned URLs for images
+      // Presigned URLs now have 7 days expiration to avoid 403 errors on cached data
       final cardDtos = await Future.wait(
         paginatedCards.map((card) async {
           final dto = await card.toDto(

mnemo_cards_backend/lib/storage/minio_config.dart

@@ -15,8 +15,9 @@ class MinioConfig {
   static const String cardImagesBucket = 'card-images';
   static const String voiceAudioBucket = 'voice-audio';
 
-  // Presigned URL expiration (4 hours)
+  // Presigned URL expiration (7 days)
-  static const int presignedUrlExpirySeconds = 4 * 60 * 60;
+  // Increased from 4 hours to prevent 403 errors on cached card data
+  static const int presignedUrlExpirySeconds = 7 * 24 * 60 * 60;
 
   MinioConfig({
     required this.endpoint,

mnemo_cards_web_v2/lib/domain/services/http_repository_v2.dart

@@ -251,6 +251,16 @@ class HttpRepositoryV2 {
           originalError: error,
         );
         break;
+      case 409:
+        // Conflict - typically means resource already exists (e.g., pack already purchased)
+        apiException = ServerException(
+          message: message.isNotEmpty 
+              ? message 
+              : 'Conflict: This resource already exists or is already purchased',
+          statusCode: 409,
+          originalError: error,
+        );
+        break;
       case null:
         apiException = NetworkException(
           message: message.isNotEmpty ? message : 'Network error',
@@ -1059,7 +1069,10 @@ class HttpRepositoryV2 {
   }
 
   /// Get pack purchase details (includes ad reward offers)
-  Future<CardPackBuyDto?> getPackBuy(String packId) async {
+  /// Returns a tuple with CardPackBuyDto and isPurchased flag
+  Future<({CardPackBuyDto packInfo, bool isPurchased})?> getPackBuy(
+    String packId,
+  ) async {
     try {
       final response = await _dio.get<Map<String, dynamic>>(
         ApiConfigV2.packBuy(packId),
@@ -1068,7 +1081,9 @@ class HttpRepositoryV2 {
       if (data == null) {
         return null;
       }
-      return CardPackBuyDto.fromJson(data);
+      final packInfo = CardPackBuyDto.fromJson(data);
+      final isPurchased = data['isPurchased'] as bool? ?? false;
+      return (packInfo: packInfo, isPurchased: isPurchased);
     } on DioException catch (e) {
       if (e.response?.statusCode == 404) {
         return null;

mnemo_cards_web_v2/lib/domain/services/purchases_service.dart

@@ -13,7 +13,10 @@ class PurchasesService {
   final HttpRepositoryV2 _httpRepository;
 
   /// Get pack purchase information (includes preview cards, price, items)
-  Future<CardPackBuyDto?> getPackBuy(String packId) async {
+  /// Returns a tuple with CardPackBuyDto and isPurchased flag
+  Future<({CardPackBuyDto packInfo, bool isPurchased})?> getPackBuy(
+    String packId,
+  ) async {
     log('Getting pack buy info for $packId', name: 'PurchasesService');
     try {
       return await _httpRepository.getPackBuy(packId);

mnemo_cards_web_v2/lib/domain/state/purchase_state_manager.dart

@@ -49,16 +49,26 @@ class PurchaseStateManager extends StateManager<PurchaseState> {
         emit(const PurchaseState.loading());
 
         try {
-          final packInfo = await _purchasesService.getPackBuy(packId);
+          final result = await _purchasesService.getPackBuy(packId);
           
-          if (packInfo == null) {
+          if (result == null) {
             emit(const PurchaseState.error(
               message: 'Pack not found or not available for purchase',
             ));
             return;
           }
 
-          emit(PurchaseState.loaded(packInfo: packInfo));
+          // Check if pack is already purchased
+          if (result.isPurchased) {
+            emit(PurchaseState.completed(
+              packInfo: result.packInfo,
+              message: 'This pack is already purchased. You already have access to it.',
+            ));
+            log('Pack is already purchased', name: 'PurchaseStateManager');
+            return;
+          }
+
+          emit(PurchaseState.loaded(packInfo: result.packInfo));
           log('Pack purchase info loaded', name: 'PurchaseStateManager');
         } catch (e, s) {
           log(

mnemo_cards_web_v2/lib/presentation/pages/purchase/purchase_page.dart

@@ -9,6 +9,7 @@ import 'package:yx_state_flutter/yx_state_flutter.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import '../../../di/app_scope/app_scope_container.dart';
+import '../../../domain/exceptions/api_exception.dart';
 import '../../../domain/state/purchase_state_manager.dart';
 import '../../../utils/color_extension.dart';
 import '../../widgets/error_view.dart';
@@ -119,8 +120,26 @@ class _PurchasePageState extends State<PurchasePage> {
         name: 'PurchasePage',
       );
       if (mounted) {
+        String errorMessage = 'Purchase error: ${e.toString()}';
+        
+        // Handle specific error cases
+        if (e is ServerException && e.statusCode == 409) {
+          errorMessage = 'This pack is already purchased. You already have access to it.';
+        } else if (e is ValidationException) {
+          errorMessage = e.message;
+        } else if (e is ServerException) {
+          errorMessage = e.message.isNotEmpty 
+              ? e.message 
+              : 'Server error occurred. Please try again.';
+        }
+        
         ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('Purchase error: ${e.toString()}')),
+          SnackBar(
+            content: Text(errorMessage),
+            backgroundColor: e is ServerException && e.statusCode == 409 
+                ? Colors.orange 
+                : Colors.red,
+          ),
         );
       }
     } finally {
@@ -233,7 +252,7 @@ class _PurchasePageState extends State<PurchasePage> {
     final theme = Theme.of(context);
     final packColor = packInfo.color?.asColor ?? theme.colorScheme.primary;
 
-    return Expanded(
+    return SingleChildScrollView(
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.stretch,
         children: [
@@ -243,12 +262,18 @@ class _PurchasePageState extends State<PurchasePage> {
           // Preview cards
           if (packInfo.cards.isNotEmpty) _PreviewCards(cards: packInfo.cards),
 
-          Expanded(
+          // Items (description, features, etc.)
-            child: Column(
+          if (packInfo.items != null && packInfo.items!.isNotEmpty)
-              children: [
+            Padding(
-            ...?packInfo.items?.build(),
+              padding: const EdgeInsets.all(16.0),
-            ],),
+              child: Column(
-          ),
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  ...packInfo.items!.build(),
+                ],
+              ),
+            ),
+
           // Purchase button
           Padding(
             padding: const EdgeInsets.all(16.0),