Some Things We Learned While Implementing in-app Purchase in Android

You need to add licensed testers

W/BillingHelper: Couldn’t find purchase lists, trying to find single data. W/BillingHelper: Received a bad purchase data.
W/BillingHelper: Couldn’t find single purchase data as well.

Invalidating a purchase to test it again

Handling products that user can buy more than once

Conclusion

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