title: How to use appStoreReceiptURL
body: <p>transactionReceipt is deprecated.
   But I am not able to use,</p>
  
  <pre><code>[[NSBundle mainBundle] appStoreReceiptURL].
  </code></pre>
  
  <p>This is supposed to return a url to a receipt if there is one. But for me there isn't one, as this value is nil, and as far as I can tell it shouldn't be. I'm running on iOS 7 and have done a few in-app purchases (sandbox on the device).</p>
  
  <p>Can anyone help          .</p>