require_once 'HTTP/Request2.php';
$request = new HTTP_Request2();
$request->setUrl('<domain>/<api prefix>/<version>/commerce/update-cart/');
$request->setMethod(HTTP_Request2::METHOD_GET);
$request->setConfig(array(
'follow_redirects' => TRUE
$request->setHeader(array(
'Authorization' => 'Bearer <access token>'
$request->addPostParameter(array(
$response = $request->send();
if ($response->getStatus() == 200) {
echo $response->getBody();
echo 'Unexpected HTTP status: ' . $response->getStatus() . ' ' .
$response->getReasonPhrase();
catch(HTTP_Request2_Exception $e) {
echo 'Error: ' . $e->getMessage();