In-app billing. How to store information that user has paid?

Question

There was a similar subject here

Okay. We can find out about user\'s purchase using RESTORE_TRANSACTIONS request to Google Play. But. It is written in documentation

Answer 1

I would suggest:

3) Use the in-app Shared-Preferences Class or SQLite Database

(Check this page: http://developer.android.com/guide/topics/data/data-storage.html)

Encryption is always good, but this way the data is so to say attached to your application and can usually not be accessed by other apps.