title: StoreKit verification error 21002: The data in the receipt-data property was malformed
body: <p>On a iPhone 4/iOS 4 device, sandbox App Store is reporting this error during verification:</p>
  <blockquote>
  <p>21002: The data in the receipt-data property was malformed.</p>
  </blockquote>
  <p>On a iPhone 5/iOS 6 device, the same code works (status == 0, receipt returned) without any problems.</p>
  <p>I've restarted the device, made sure the Apple ID is logged out, even made a new test user account. Same result. Any ideas?</p>