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Amazon App Store equivalent of Google Play Licensing?

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http://stackoverflow.com – I have developed a standalone "unlocker"/key-app that unlocks features in a separate free app. I am using the Google Play Licensing library to determine if the user has paid for the app and then issue an "unlock" command to the separately installed free app. I know that Amazon applies its own DRM to every app (i.e. the app checks in with Amazon's App Store to see if it's been purchased on every launch), but is there an equivalent to the Google Play Licensing library that developers can use to perform their own checks? (HowTos)