wassenger API via curl

wa.php

$data = array("phone" => "+6281290004782", "message" => "Hai pak, apa kabar?");                     
$data_string = json_encode($data);                                          
                                                                                                                     
$ch = curl_init('https://api.wassenger.com/v1/messages');                         
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");                      
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);                  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);                         
curl_setopt($ch, CURLOPT_HTTPHEADER, array(                                
    'Content-Type: application/json',                                             
    'Token: your-api-token',
));
                                                                                                                  
$result = curl_exec($ch);