使用RevenueCat，您可以在购买行之后执行任何操作。

static Future<Package?> makePurchases(Package? package, ValueNotifier<bool> isWaiting) async {
        try {
          isWaiting.value = true;
          purchaserInfo = await Purchases.purchasePackage(package!);
          await Purchases.syncPurchases();
          if (purchaserInfo.entitlements.all["Pro"]!.isActive) {
            purchaserInfo = await Purchases.purchasePackage(package);
          }
    
          // here purchase is done
          // do something
    
          isWaiting.value = false;
        } on PlatformException catch (e) {
          var errorCode = PurchasesErrorHelper.getErrorCode(e);
          if (errorCode != PurchasesErrorCode.purchaseCancelledError) {}
    
          isWaiting.value = false;
        }
        isWaiting.value = false;
        return null;
      }