In-App Purchase Programming Guide - Apple Developer

Delivering Products
Suggested Testing Steps
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Update your app’s UI to let the user access the product.
To finish a transaction, call the finishTransaction: method on the payment queue.
SKPaymentTransaction *transaction = ;
SKPaymentQueue *queue = [SKPaymentQueue defaultQueue];
[defaultQueue finishTransaction:transaction;]
After you finish a transaction, don’t take any actions on that transaction or do any work to deliver the product.
If any work remains, your app isn’t ready to finish the transaction yet.
Note: Don’t try to call the finishTransaction: method before the transaction is actually
completed, attempting to use some other mechanism in your app to track the transaction as
unfinished. Store Kit isn’t designed to be used this way. Doing so prevents your app from downloading
Apple-hosted content and can lead to other issues.
Suggested Testing Steps
Test each part of your code to verify that you’ve implemented it correctly.
Test a Payment Request
Create an instance of SKPayment using a valid product identifier that you’ve already tested. Set a breakpoint
and inspect the payment request. Add the payment request to the transaction queue, and set a breakpoint to
confirm that the paymentQueue:updatedTransactions: method of your observer is called.
During testing, it’s OK to finish the transaction immediately without providing the content. However, even
during testing, failing to finish the transaction can cause problems: unfinished transactions remain in the queue
indefinitely, which could interfere with later testing.
Verify Your Observer Code
Review the transaction observer’s implementation of the SKPaymentTransactionObserver protocol. Verify
that it can handle transactions even if you aren’t currently displaying your app’s store UI and even if you didn’t
recently initiate a purchase.
Locate the call to the addTransactionObserver: method of SKPaymentQueue in your code. Verify that
your app calls this method at app launch.
2013-10-22 | Copyright © 2013 Apple Inc. All Rights Reserved.
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