Google Firebase notifications running on console but not API

Question

The notification service is great when sending from the firebase console, but does not work when sending from the API. Even when the result shows success: {"Multicast_id": 5946406103096345260, "success": 1, "failure": 0, "canonical_ids": 0, "Results": [{"message_id": "0: 1480093752122166% 13791f60f9fd7ecd"}] }

Anyway, heres the code:

<?php
// Payload data you want to send to Android device(s)
// (it will be accessible via intent extras)    
$data = array('title' => 'Notification Title' ,'message' => 'Hello World!');

// The recipient registration tokens for this notification  
$ids = array('TOKEN');

// Send push notification via Google Cloud Messaging
sendPushNotification($data, $ids);

function sendPushNotification($data, $ids)
{
    // Insert real GCM API key from the Google APIs Console        
    $apiKey = 'API_KEY';

    // Set POST request body
    $post = array(
                    'registration_ids'  => $ids,
                    'data'              => $data,
                 );

    // Set CURL request headers 
    $headers = array( 
                        'Authorization: key=' . $apiKey,
                        'Content-Type: application/json'
                    );

    // Initialize curl handle       
    $ch = curl_init();

    // Set URL to GCM push endpoint     
    curl_setopt($ch, CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send');

    // Set request method to POST       
    curl_setopt($ch, CURLOPT_POST, true);

    // Set custom request headers       
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

    // Get the response back as string instead of printing it       
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    // Set JSON post data
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($post));

    // Actually send the request    
    $result = curl_exec($ch);

    // Handle errors
    if (curl_errno($ch))
    {
        echo 'GCM error: ' . curl_error($ch);
    }

    // Close curl handle
    curl_close($ch);

    // Debug GCM response       
    echo $result;
}

?> 

Answer 1

FCM only sends push notifications when using a payload notification, for example:

{ 
  "to: "registration token",
  "priority": "high",
  "notification": {
    "title": "Title",
    "text": "Text"
  },
  ...
}

}

See also Firebase Docs