Android in-app purchase of a subscription with a free trial - how to avoid abuse?

Question

I\'ve searched high and low for guidance on how best to address this... I\'ve read Google Play In-App Subscriptions (http://developer.android.com/google/play/bi

Answer 1

I am also using in app billing but google always provide one free trial per user. If u subscribe same sku again then google will not provide trial period to that user.