title: Firebase Notification not received on device when sent via cURL/PHP
body: <p>I have an iOS app which is live on the app store. I am able to send push notifications to iOS devices which have the app installed, but only when I send them from the Firebase console.</p>
  
  <p>When I try to send push notifications via a cURL request, the response from the server indicates that I was successful but the message isn't received on the device. I have tried this with both multicast and single recipient payloads.</p>
  
  <p>I must be missing something more fundamental, but I can't see it.</p>
  
  <p>Here is my PHP code:</p>
  
  <pre><code>&lt;?php
  // API access key from Google API's Console
  define( 'API_ACCESS_KEY', 'AI*****4LPGkx8xtDG2tBl*****7KWJfmp1szcA' );
  $registrationIds = array( $_GET['id'] );
  // prep the bundle
  $msg = array
  (
      'message'   =&gt; 'here is a message. message',
      'title'     =&gt; 'This is a title. title'
  );
  $fields = array
  (
      'to'            =&gt; "cUxd-iTVVWo:APA*****kQTuqJ5RREKhhlJjm27NCuVfUn5APg3lBFqh-YWjgx*****iOpAQeLB14CzM2YTwIJo_75jzCmbFLKj0_zpKSHvAEbmJz*****BBezGJIng-N4H-cAD6ahY7mQNYZtEJLAIE",
      'data'          =&gt; $msg
  );
  
  $headers = array
  (
      'Authorization: key=' . API_ACCESS_KEY,
      'Content-Type: application/json'
  );
  
  $ch = curl_init();
  curl_setopt( $ch,CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send' );
  curl_setopt( $ch,CURLOPT_POST, true );
  curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
  curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
  curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
  curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );
  $result = curl_exec($ch );
  curl_close( $ch );
  echo $result;
  </code></pre>
  
  <p>Here is the response I get when running this code:</p>
  
  <blockquote>
    <p>{"multicast_id":5814921248239922706,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1476193002715692%a4ddee3cf9fd7ecd"}]}</p>
  </blockquote>