Apple definitely provides you with unique details about the transaction and your system can verify whether renewal occurred or not. Wish they would add an API f

Apple definitely provides you with unique details about the transaction and your system can verify whether renewal occurred or not. Wish they would add an API for cancelling. It would significantly reduce the number of rude emails we get from people if we could offer a cancel button in the app. However, it would not solve the issue of people that think that simply deleting the app will cancel the subscription, or dissuade people from insisting that we cancel the subscription for them.