title: iOS sandbox environment auto-renewal subscription
body: <p>I have the following questions regarding iOS auto-renewable subscriptions </p>
  
  <p>a) Are auto-renewal subscriptions really auto-renewing in the sandbox environment? The problem seems to be that subscriptions are not renewed automatically although the documentation says that even in sandbox environment it should happen 6 times.</p>
  
  <p>b) Do we need to call restoreCompletedTransactions to get new receipt for automatically extended subscription, or is -paymentQueue:updatedTransactions: method called automatically by iOS? (I guess it automatically called on 'launch' &amp; 'rotation out of background' not sure)</p>
  
  <p>c) How have you handled the same subscription on multiple devices? This can be handled by restoreCompletedTransactions, but calling it will prompt users password, so it is not very handy to call it every time the app starts.</p>