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I'm just starting to think about diving into augmented reality. Any suggestions on where I should start? For example, any good tutorials or white papers out there to get the get started with the basics and get some MVPs cranked out?

I have renewing subscriptions working in Test Flight and wanted to validate a few things to make sure things will work the same in production before I go live. When a user purchases a subscription, I validate the receipt, finish the transaction and then save the original receipt to a database for that user. On app startup, I get the receipt from the database, validate it again and check the expiration date. If it's not expired I let them in. This all works even when the subscription auto-renews. When I pull the receipt from my database and validate it, the new subscription end date is there after an auto-renew and it all looks great! It's all working with the original receipt from the original purchase. Is it supposed to work this way? I thought each renewal of a subscription had a new receipt. I just want to make sure it works the same in production, otherwise all my subscriptions will stop working after the first renewal. If it matters, I am using React Native and the dooboolab iap library.