title: Firebase Cloud Messaging With AWS SNS
body: <p>I am trying to integrate FCM with SNS. I read in this <a href="https://stackoverflow.com/a/38626398">answer</a> that the setup should be identical with GCM. I managed to create an FCM app and can send messages to an android device. The device receives a notif in tray when app is in background, or print received message when app is in foreground. I am trying to integrate it now to SNS but I can't seem to make it work, no error message whatsoever.</p>
  
  <p>In create platform, which key should I use? I used the one form firebase console-> project settings-> cloud messaging -> Server key
  Is this wrong? </p>
  
  <p>For the platform endpoint, I used FCM token for Device Token, which is also used when sending notif in firebase console. 
  Also what should I put in User Data, will any arbitrary string do?</p>
  
  <p>For the message, I used the Json Generated in SNS console. Does FCM accept different format from GCM?</p>
  
  <p>Am I missing something?</p>