An upcoming change in the App Store terms of service means that Apple won’t require publishers to offer in-app subscriptions to periodicals at the same or better price than are available elsewhere. As of 30 June 2011, publishers may charge any rate for a subscription in an app, or not offer subscriptions via in-app purchase at all. However, they still cannot provide a link to buy a subscription outside the app. follow link
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Apple Changes In-App Subscription Rules