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I want to use in-app billing to control some application features,
actually i want to remove ads from users who decide to support my app.
The problem is not how to use in-app billing for purchase, but how to manage the case on which the user will uninstall the app;ication and reinstall it later.
In that case how the application should know if the upgrade has been purchased or not?
I must implement an external service? Or there is also a support for tracking orders by a specific user ?
You don’t need an external service. You can set your InApp purchase item to ‘managed purchase’ on Google Play (Android Market). On app startup, send RESTORE_TRANSACTIONS BillingRequest to Google Play. This request retrieves a user’s transaction status for managed purchases. You should send this request only when you need to retrieve a user’s transaction status, which is usually only when your application is reinstalled or installed for the first time on a device.