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Editorial Team
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Asked: 2026-05-26T19:56:59+00:00

I want to implement in-app purchases to my app. I will be using the

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I want to implement in-app purchases to my app. I will be using the built-in product model where the IAP will unlock features within the code. My questions are:

  • how do I track the a purchase on a device (as to unlock the feature)? NSUserDefaults? The guide vaguely states “application preferences”. They are not referring the Info.plist, as this can’t be written once on the device. I also (obviously) want the user to back this up.

  • how do I enable the feature across mutiple devices on the same iTunes account? Do they have to “purchase” the feature on the other devices, or is there another way?

Thanks and regards,

–John

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  1. Editorial Team

    1) NSUSerDefaults is a good solution

    2) Use a non consumable product for that http://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/StoreKitGuide/APIOverview/OverviewoftheStoreKitAPI.html#//apple_ref/doc/uid/TP40008267-CH100-SW1

    User have to re-buy the product in each device but pay just the first time. A pop up “you’ve already buy this item” appear and you receive the same receipt.

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