title: inApp purchase multiple device for same user
body: <p>I integrated <strong>inApp purchase</strong> in the app to unlock other content using server model i.e i sent a receipt data to the server for validation.</p>
  
  <p><strong>Problem</strong> : If user has multiple devices suppose Device1 and Device2</p>
  
  <ol>
  <li>Device1: user installs XYZ app, registers itself with mailed/password and then subscribed the content.</li>
  <li>Device2: (same user) user installs XYZ app, registers itself with mailed/password and go to subscription page.</li>
  </ol>
  
  <p><strong>Question</strong> : How can I came to know that this Device2 belongs to the same user who already subscribed from Device1?</p>
  
  <p><strong>Thanks</strong></p>