fix: revert to OpenIAP standard method names

- Use getAvailablePurchases instead of getActivePurchases to match OpenIAP spec
- Keep getPurchaseHistories as per OpenIAP spec
- Update examples to use correct method names

Author: hyochan

example/lib/src/screens/available_purchases_screen.dart

@@ -66,7 +66,7 @@ class _AvailablePurchasesScreenState extends State<AvailablePurchasesScreen> {
 
     try {
       // Load available purchases (non-consumed)
-      final availablePurchases = await _iap.getActivePurchases();
+      final availablePurchases = await _iap.getAvailablePurchases();
 
       // Load purchase history
       final purchaseHistory = await _iap.getPurchaseHistories();
@@ -94,7 +94,7 @@ class _AvailablePurchasesScreenState extends State<AvailablePurchasesScreen> {
     });
 
     try {
-      final restored = await _iap.getActivePurchases();
+      final restored = await _iap.getAvailablePurchases();
       setState(() {
         _availablePurchases = restored;
       });

example/lib/src/screens/debug_purchases_screen.dart

@@ -36,7 +36,7 @@ class _DebugPurchasesScreenState extends State<DebugPurchasesScreen> {
       await Future<void>.delayed(const Duration(seconds: 1));
 
       // Get all available purchases
-      final purchases = await _iap.getActivePurchases();
+      final purchases = await _iap.getAvailablePurchases();
 
       setState(() {
         _purchases = purchases;

lib/flutter_inapp_purchase.dart

@@ -376,9 +376,9 @@ class FlutterInappPurchase
     await requestPurchase(request: request, type: type);
   }
 
-  /// Get non-consumed purchases (active purchases that haven't been finished)
-  /// Returns purchases that are still pending acknowledgment or consumption
-  Future<List<iap_types.Purchase>> getActivePurchases() async {
+  /// Get all available purchases (OpenIAP standard)
+  /// Returns non-consumed purchases that are still pending acknowledgment or consumption
+  Future<List<iap_types.Purchase>> getAvailablePurchases() async {
     if (!_isInitialized) {
       throw iap_types.PurchaseError(
         code: iap_types.ErrorCode.eNotInitialized,
@@ -417,7 +417,7 @@ class FlutterInappPurchase
     } catch (e) {
       throw iap_types.PurchaseError(
         code: iap_types.ErrorCode.eServiceError,
-        message: 'Failed to get active purchases: ${e.toString()}',
+        message: 'Failed to get available purchases: ${e.toString()}',
         platform: iap_types.getCurrentPlatform(),
       );
     }