"You Already Have This Item" Flutter 应用内购买

Question

我在我的应用中使用应用内购买。无忧购买。但是当我想第二次购买相同的产品时，这个 Play 商店会显示“您已经拥有该商品”。我希望我的产品被一次又一次地购买。我不知道如何解决它。非常感谢你的帮助。我在下面留下了我的源代码。

      InAppPurchase iap = InAppPurchase.instance;

      bool available = true;

      List<ProductDetails> products = [];

      List<PurchaseDetails> purchases = [];

      StreamSubscription subscription;

      int credits = 0;

      @override
      void initState() {
        initialize();
        super.initState();
      }

      @override
      void dispose() {
        subscription.cancel();
        super.dispose();
      }

      void initialize() async {
        available = await iap.isAvailable();

        if (available) {
          await getProducts();


          verifyPurchase();

          subscription = iap.purchaseStream.listen((data) => setState(() {
                print('New Purchase');
                purchases.addAll(data);
                verifyPurchase();
              }));
        }
      }

      Future<void> getProducts() async {
        Set<String> ids = Set.from(['buy_300_wecoin']);
        ProductDetailsResponse response = await iap.queryProductDetails(ids);

        setState(() {
          products = response.productDetails;
        });
      }

      PurchaseDetails hasPurchased(String productID) {
        return purchases.firstWhere((purchase) => purchase.productID == productID,
            orElse: () => null);
      }

      bool verifyPurchase() {
        PurchaseDetails purchase = hasPurchased('buy_300_wecoin');
        if (purchase != null && purchase.status == PurchaseStatus.purchased) {
          return true;
        }
      }

      void buyProduct(ProductDetails prod) {
        final PurchaseParam purchaseParam = PurchaseParam(productDetails: prod);
        iap.buyConsumable(purchaseParam: purchaseParam, autoConsume: false);
      }

Answer 1

您应该使用消耗品应用内购买

A consumable product is one that a user consumes to receive in-app content, such as in-game currency. When a user consumes the product, your app dispenses the associated content, and the user can then purchase the item again.

Note that the App Store does not have any APIs for querying consumable products, and Google Play considers consumable products to no longer be owned once they're marked as consumed and fails to return them here. For restoring these across devices you'll need to persist them on your own server and query that as well.

尝试 in_app_purchase 库并阅读有关使用此库的消耗性 IAP。