Setup client
require 'vendor/autoload.php';
use Onetoweb\Gls\Shipit\Client;
// params
$user = 'user';
$password = 'password';
$baseHref = 'base_href';
// setup client
$client = new Client($user, $password, $baseHref);
// add requester (optional)
$client->setRequester('Requester');