Simple In App Purchase App Android

Does this library (AndroidBillingLibrary) solve your problem?

The current version of Android In App Purchase is V3

http://blog.blundellapps.com/simple-inapp-billing-payment-v3/

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My blog post is titled Simple In App Purchase v2, so that might help:

http://blog.blundellapps.com/simple-inapp-billing-payment/

I've also recently written an overview with a flowchart to try and explain InApp Purchase (not so simple):

http://blog.blundellapps.com/overview-of-android-in-app-billing-flowchart/ (v2)