如何在Flutter中访问应用内购买历史记录？

Question

I would like to implement in-app purchases in flutter using the flutter_inapp_purchase library.

Purchasing the item using buyProduct() already works, however I would like to ensure that customers who have already purchased an item are forwarded automatically and are not interrupted with the purchase dialog. This is why I request the purchase history of the customer with

List<PurchasedItem> purchaseHistory =
                      await FlutterInappPurchase.getPurchaseHistory();

However I have trouble working with the received purchaseHistory list, how do I now check whether the in-app purchase id of eg 'com.test.points100' is contained in that list or not, ie whether the user has already purchased the item wtih the id 'com.test.points100' ?

Answer 1

Did you try

List<PurchasedItem> purchaseHistory =
                  await FlutterInappPurchase.getPurchaseHistory();
int purchaseIndex = purchaseHistory.indexWhere((item) =>
    item.productId == "com.test.points100"
);
bool hasPurchased = purchaseIndex >= 0;

Note I'm not familiar with this library - it may be that getPurchaseHistory returns cancelled or invalid purchases as well - better check that.