addPayment method

Future<void> addPayment(SKPaymentWrapper payment)

Posts a payment to the queue.

This sends a purchase request to the App Store for confirmation. Transaction updates will be delivered to the set SkTransactionObserverWrapper.

A couple preconditions need to be met before calling this method.

• At least one SKTransactionObserverWrapper should have been added to the payment queue using addTransactionObserver.
• The payment.productIdentifier needs to have been previously fetched using SKRequestMaker.startProductRequest so that a valid SKProduct has been cached in the platform side already. Because of this payment.productIdentifier cannot be hardcoded.

This method calls StoreKit's `-[SKPaymentQueue addPayment:]` (https://developer.apple.com/documentation/storekit/skpaymentqueue/1506036-addpayment?preferredLanguage=occ).

Also see sandbox testing.

Implementation

Future<void> addPayment(SKPaymentWrapper payment) async {
  assert(_observer != null,
      '[in_app_purchase]: Trying to add a payment without an observer. One must be set using `SkPaymentQueueWrapper.setTransactionObserver` before the app launches.');
  final Map<String, dynamic> requestMap = payment.toMap();
  await channel.invokeMethod<void>(
    '-[InAppPurchasePlugin addPayment:result:]',
    requestMap,
  );
}