A mutable request to the App Store to process payment for additional functionality offered by your app.
- iOS 3.0+
- macOS 10.7+
- tvOS 9.0+
A mutable payment object identifies a product and the quantity of that item the user would like to purchase.
When a mutable payment is added to the payment queue, the payment queue copies the contents into an immutable request before queueing the request. Your app can safely change the contents of the mutable payment object.