Flutter: get past purchases on Android - flutter

Question

I'm refactoring in_app_purchases and I'm trying to get the past purchases. According to the documentation:
The InAppPurchaseConnection.queryPastPurchases method has been
removed. Instead, you should use InAppPurchase.restorePurchases. This
method emits each restored purchase on the
InAppPurchase.purchaseStream, the PurchaseDetails object will be
marked with a status of PurchaseStatus.restored
But the example they provide doesn't get the past purchases, it adds the one you buy at that moment.
I moved from this:
final QueryPurchaseDetailsResponse purchaseResponse =
await _connection.queryPastPurchases();
to this:
final Stream<List<PurchaseDetails>> purchaseUpdated = inAppPurchase.purchaseStream;
print(purchaseUpdated.toList());
I tried the above but the list is empty and for sure my user has purchases as I can show here when I try to buy the same version I bought before:
How could get a List from previous purchases?

Answer 1

You have to listen to the purchaseStream like this code in the example:
final Stream<List<PurchaseDetails>> purchaseUpdated =
_inAppPurchase.purchaseStream;
_subscription = purchaseUpdated.listen((purchaseDetailsList) {
_listenToPurchaseUpdated(purchaseDetailsList);
}, onDone: () {
_subscription.cancel();
}, onError: (error) {
// handle error here.
});
All the purchased items will be added to this stream, so you need to add all the results to your list like below:
final List<PurchaseDetails> purchasedList = [];
final Stream<List<PurchaseDetails>> purchaseUpdated =
_inAppPurchase.purchaseStream;
_subscription = purchaseUpdated.listen((purchaseDetailsList) {
purchasedList.addAll(purchaseDetailsList);
}, onDone: () {
_subscription.cancel();
}, onError: (error) {
// handle error here.
});
Now you can use purchasedList as previous purchases. By the way, all the newly purchased items will be also added to that stream and purchasedList.
UPDATE: After the above steps, you need to call _inAppPurchase.restorePurchases() to get the previous purchases, all the previous purchases will be added to purchasedList by the purchaseStream.