title: OneSignal how to send Push to specific device - ionic
body: <p>I want onesignal to be able to send push notification to a specific device. </p>
  
  <ol>
  <li><p>How do I capture the device id of the device ?</p></li>
  <li><p>And what API do I use to push to that specific device ?</p></li>
  </ol>
  
  <p>Thanks.</p>