Cannot receive notifications in ionic framework GCM

I am using ngcordova push plugin for android with ionic framework. My device is getting registered in GCM. I get the registration id as well. I am able to store the regid in users table. Everything works fine till now. But when I send the notification from my php server I cannot receive the notification in my mobile phone. The response of the gcm to php code I get is:

  {"multicast_id":5214502018855543648,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1439022666580761%156ac804f9fd7ecd"}]}

My JavaScript code is.

.run(function($ionicPlatform,ngFB,$state,$cordovaPush,$rootScope) {
$ionicPlatform.ready(function() {


// ------------------------------ GCM NG-CORDOVA PUSH-----------------------------------
var androidConfig = {
    "senderID": "XXXXXXXXXX"
  };
 $cordovaPush.register(androidConfig).then(function(result) {
      // Success
      alert(result);
    }, function(err) {
      // Error
      alert(err);
    });

    $rootScope.$on('$cordovaPush:notificationReceived', function(event, notification) {
      switch(notification.event) {
        case 'registered':
          if (notification.regid.length > 0 ) {
            alert('registration ID = ' + notification.regid);
            $rootScope.reg_id = notification.regid;
          }
          break;

        case 'message':
          // this is the actual push notification. its format depends on the data model from the push server
          alert('message = ' + notification.message + ' msgCount = ' + notification.msgcnt);
          break;

        case 'error':
          alert('GCM error = ' + notification.msg);
          break;

        default:
          alert('An unknown GCM event has occurred');
          break;
      }
    });



    // WARNING: dangerous to unregister (results in loss of tokenID)
   // $cordovaPush.unregister(options).then(function(result) {
      // Success!
    //}, function(err) {
      // Error
    //})


  });


})

My php code is:

<?php
// API access key from Google API's Console
define( 'API_ACCESS_KEY', 'YOUR-API-ACCESS-KEY-GOES-HERE' );
$registrationIds = array( $_GET['id'] );
// prep the bundle
$msg = array
(
    'message'   => 'here is a message. message',
    'title'     => 'This is a title. title',
    'subtitle'  => 'This is a subtitle. subtitle',
    'tickerText'    => 'Ticker text here...Ticker text here...Ticker text here',
    'vibrate'   => 1,
    'sound'     => 1,
    'largeIcon' => 'large_icon',
    'smallIcon' => 'small_icon'
);
$fields = array
(
    'registration_ids'  => $registrationIds,
    'data'          => $msg
);

$headers = array
(
    'Authorization: key=' . API_ACCESS_KEY,
    'Content-Type: application/json'
);

$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, 'https://android.googleapis.com/gcm/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;

I don't understand where I am wrong. Please help me.

Thanks