tdd 진행

mobile/lib/services/in_app_purchase_service.dart

@@ -45,6 +45,16 @@ class InAppPurchaseService extends ChangeNotifier {
   bool get isLoading => _isLoading;
   String? get error => _error;
   
+  // 구매 검증 관련 게터/세터
+  bool get isPurchaseVerified => _purchaseVerified;
+  set isPurchaseVerified(bool value) => _purchaseVerified = value;
+  PurchaseDetails? get lastVerifiedPurchase => _purchases.isNotEmpty ? _purchases.last : null;
+  set lastVerifiedPurchase(PurchaseDetails? value) {
+    if (value != null && !_purchases.contains(value)) {
+      _purchases.add(value);
+    }
+  }
+  
   InAppPurchaseService() {
     _initialize();
   }
@@ -195,9 +205,8 @@ class InAppPurchaseService extends ChangeNotifier {
     String platform = Platform.isIOS ? 'ios' : 'android';
     
     if (Platform.isIOS) {
-      final InAppPurchaseStoreKitPlatformAddition iosPlatformAddition =
-          _inAppPurchase.getPlatformAddition<InAppPurchaseStoreKitPlatformAddition>();
-      receiptData = await iosPlatformAddition.retrieveReceiptData();
+      // iOS의 경우 구매 정보에서 직접 가져오기
+      receiptData = purchaseDetails.verificationData.serverVerificationData;
     } else if (Platform.isAndroid) {
       if (purchaseDetails is GooglePlayPurchaseDetails) {
         receiptData = purchaseDetails.billingClientPurchase.originalJson;