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The aim of this guide is to help you finalize the receipt validation process by computing the GUID hash for your app, and comparing it to the hash that’s stored within your receipt itself. This is a continuation of my receipt validation series. I’m assuming that… You’ve prepared to test receipt validation by setting up your app in iTunes Connect. You’ve brought in a cryptography library like OpenSSL to be able to work with the PKCS #7 container that acts as the “envelope” for the receipt....