Facebook Webhook handler example

facebook-webhook-handler.php

<?php

/**
 * Facebook Webhook handler example
 *
 * @see  https://fb.me/webhooks
 * @author  Tom (https://github.com/tominon)
 */


$verifyToken = 'VERIFY_TOKEN'; // You will specify it when you enable the Webhook for your app
$appSecret = 'APP_SECRET';

// Handle verification request
if (isset($_GET['hub_mode']) && $_GET['hub_mode'] === 'subscribe') {
    if ($_GET['hub_verify_token'] === $verifyToken) {
        echo $_GET['hub_challenge'];
        exit;
    }
}

// Validate the integrity and payload and it's origin
$payload = file_get_contents('php://input');
if (isset($_SERVER['HTTP_X_HUB_SIGNATURE']) && hash_equals(explode('=', $_SERVER['HTTP_X_HUB_SIGNATURE'])[1], hash_hmac('sha1', $payload, $appSecret))) {
    // Handle payload
    $data = json_decode($payload, true);
    file_put_contents(time().'-webhook.php', $payload);
    exit;
}

header('HTTP/1.1 500 Internal Server Error');
exit(1);

Hello,

I have followed all the steps and it seems that everything is well done, when I performed any test, I get empty data and I don't understand why.
If I use Postman I can collect all the data.

Please, I need to be able to solve this.

Best regards and thanks.

Hi, this is a 6 year old example and may not work anymore. Get the latest information here: https://developers.facebook.com/docs/graph-api/webhooks

Hi, this is a 6 year old example and may not work anymore. Get the latest information here: https://developers.facebook.com/docs/graph-api/webhooks

Hello,

yes yes I know, I have followed the steps of the documentation that you pass me but I get empty data, I have been able to link the webhook and I receive the hub, but then with each test I get nothing, would you know why?

Thanks