ios - Apple - In app purchase: How to make sure the user is authorised to use Free trial subscription only one time? -


i have auto renewable subscription free trial. happens if user cancels subscription during trial period, , after day or week or month, buys subscription again. did trial period? if so, how can prevent it. how avoid abuse? in apple's papers - have not seen clear reference this.

validate receipt either app or server:

https://developer.apple.com/library/ios/releasenotes/general/validateappstorereceipt/introduction.html

it tell if subscription has been cancelled.


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