Listener interface for purchase updates which happen when, for example, the user buys something within the app or by initiating a purchase from Google Play Store.
Implement this method to get notifications for purchases updates.
void onPurchasesUpdated (BillingResult billingResult, List<Purchase> purchases)
Implement this method to get notifications for purchases updates. Both purchases initiated by your app and the ones initiated outside of your app will be reported here.
Warning! All purchases reported here must either be consumed or acknowledged. Failure
to either consume (via
consumeAsync(ConsumeParams, ConsumeResponseListener)) or acknowledge (via
acknowledgePurchase(AcknowledgePurchaseParams, AcknowledgePurchaseResponseListener)) a purchase will result in that purchase being refunded.
Please refer to
https://developer.android.com/google/play/billing/billing_library_overview#acknowledge for more