I have added support for the in-app purchase for a subscription to my Mac OS app. I successfully receive the SKPaymentTransaction which is great; however, I don't see how to obtain the receipt for the purchase which I believe would contain the start and end dates for the purchase. How do I get that?
The receipt is encoded. You must decode it. You can do that yourself (it's complicated) or send it to the Apple servers for decoding. This is all explained here: