restoreTransactions method
Restore previously purchased transactions.
Use this to load previously purchased content on a new device.
This call triggers purchase updates on the set
SKTransactionObserverWrapper for previously made transactions. This will
invoke SKTransactionObserverWrapper.restoreCompletedTransactions,
SKTransactionObserverWrapper.paymentQueueRestoreCompletedTransactionsFinished,
and SKTransactionObserverWrapper.updatedTransaction. These restored
transactions need to be marked complete with finishTransaction once the
content is delivered, like any other transaction.
The applicationUserName should match the original
SKPaymentWrapper.applicationUsername used in addPayment.
If no applicationUserName was used, applicationUserName should be null.
This method either triggers -[SKPayment restoreCompletedTransactions]
or -[SKPayment restoreCompletedTransactionsWithApplicationUsername:]
depending on whether the applicationUserName is set.
Implementation
Future<void> restoreTransactions({String? applicationUserName}) async {
await _hostApi.restoreTransactions(applicationUserName);
}