title: iOS Apps & Subscriptions?
body: <p>Am I <em>required</em> to use Apple's In-App Purchase support if I wish to allow for subscriptions in my app?  I'm currently working on an app that will be free to download and use.  It will be ad-supported, but I will also offer a premium version of the service that won't display ads.  Can I implement the subscription functionality myself within the app/backend service  (Registration, credit card processing, etc.)?  Or, am I required to use Apple's In-App Purchase support (thereby also giving up 30% of my subscription fee)</p>