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IOS in apps is the best way to find out if a user has purchased

I need to set a global variable when a user makes an in-app purchase. I could use NSUserDefaults and just have a key called "Acquired", but that doesn't seem very safe.

What is the best way to securely store data so that I know whether a purchase is made or not?

For example, in a particular view, I need to know whether to show or not the Buy button. Obviously, this should be hidden if they have already made a purchase.

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For secure data, you must use the iOS keychain. Here's the documentation:

http://developer.apple.com/library/mac/#documentation/Security/Conceptual/keychainServConcepts/iPhoneTasks/iPhoneTasks.html

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