require_once('vendor/autoload.php');

require_once('/path/to/quiubas-php/quiubas.php');

<?php
// Install the library via Composer or download the .zip file to your project folder.
// Load the library
require_once '/path/to/quiubas-php/quiubas.php';

\Quiubas\Quiubas::setAuth( 'api_key', 'api_private' );

$response = \Quiubas\SMS::send(array(
  'to_number' => '+52552512421',
  'message' => 'Hello there',
));

echo $response->sms_id;