I have setup In-App Billing for the first time using the new v3 API. It is working correctly on my devices but I have received a lot of error reports from other users.
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I get the same errors. I also ran into other issues...
Having more than one google account on a device disabled in-app billing on my Galaxy Tab 7. Remove one account re-enabled it.
I've seen issues with the in app billing sample code on a GT-P5110, LGL75C, and GT-S5839i among others.
(I use the code in an application with ACRA installed... so everytime it crashes, I get info)
The devices Android version ranges from 2.3.3 to 4.0.4.
It's very annoying.