App Store Apple receipt overview
Apple receipt contains the complete list of user purchases from the App Store. Your server must submit a receipt to the App Store to receive a JSON response containing the full in-app purchase details. Each response field provides the information you can use to deliver content to the user.
Here you can validate any App Store receipt online: Apple Receipt Checker
Here you can find the documentation for receipt validation: App Store Receipts
Implementing in-app subscription and validating user receipts could be a complicated and time-consuming process. It requires building a backend infrastructure, diving deep into Apple's StoreKit documentation, and maintaining the infrastructure when it's built. Qonversion offers a simple solution that allows fast in-app subscription implementation and with no server-side code required. Learn more about implementing in-app subscriptions with Qonversion here.