ios - OS X, keychain. store data that can be only changed by my app, not by user, or other app -

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On iOS we use keychain to keep information in app purchases (so users can not change them) .
We now close our app to make Mac (publish it in the Mac App Store).
Can we use Macchain to store in app purchases?
Are we some kind of China data in the key?
We want to change prices only in our app keychain, not any other app or user

Other applications can access keychains without asking the user

Users always change the data - both on Ios and osx

Except on the OSX it is really easy and on iOS It is not;)

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