iOS in app purchase, how to determine if app store user account has changed -

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i'm building app requires in app purchase. works ok, have problem.

i have list of products can purchased. when purchasing product, keep product's identifier in user defaults, can provide content though there no internet connection.

problem: user1 buys products. user1 logs out appstore (in settings). user 2 logs in appstore. open app. user 2 able see content user1 unlocked.

how prevent this?

thanks


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