title: How do auto-renewable in-app-purchase subscriptions work?
body: <p>My application currently allows the user to subscribe to our service using in-app purchase auto-renewable subscription. The app provides images, 12 images per month, and every month the user needs to renew his/her subscription to see the new content.</p>
  
  <p>I haven't work on the auto-renewable model before, so I have built a model to validate the receipt and it works, but should I check if the user subscription expired or not, and, if so, how?</p>
  
  <p>Also, does the app store only allow magazines and newspaper items to be auto-renewable?  </p>
  
  <p>I haven't worked on the auto-renewable model before, so any help on this matter would be highly appreciated.</p>