[NSCoderNightDC] In-App Purchase Receipt Validation

Hey,

I'm wondering if any of you have experience implementing in-app purchase for a non-consumable. I have several questions about the mechanics - like:

- How did you handle the differences in the receipt process so you can support iOS 6 and 7?

- Did you use a third party library to handle the decryption, signature verification, and JSON parsing?

- Local or Server validation? Your server or direct to Apple?

- How often do you check the receipt? Every time you launch? Once?

- How did you store the "success" result in a way that prevents tampering?

Thanks for your insight.

-Jon

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