Using Xenforo Validation API

[XFFA.IR Bot]

Hello!
Im trying to make a validation for WHMCS, but the API returns: Please enter a validation token

PHP:

<?php

add_hook('ShoppingCartValidateProductUpdate', 1, function($vars) {
   
    $json = json_encode($vars[customfield]);
    $transform = json_decode($json, true);

    $url = 'https://xenforo.com/customer-api/license-lookup.json';

    $data = array(
        'token' => $transform[6],
        'domain' => $transform[2]
    );
   
    $payload = json_encode($data)...

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