title: Receipt validation issue in App Purchases Mac Store "Receipt validation should be presented..."
body: <p>My applications uses the Store Kit API to purchases in app purchases. I am getting the following store rejection issue, has anyone ever encountered this?</p>
  
  <blockquote>
    <p>2.3 Apps that do not perform as advertised by the developer will be rejected</p>
    
    <p>The app is not using the Store Kit API properly. The application needs to use receipt     validation in order for Store Kit to properly
    process In App Purchases.</p>
  </blockquote>
  
  <p>I inquired further and they said: </p>
  
  <blockquote>
    <p>Receipt validation should be presented on launch of the app.</p>
  </blockquote>
  
  <p>Anyone have any idea what the issue is?</p>