public static function qrCode($invoiceId, $params = array(), $apiContext = null, $restCall = null)
{
ArgumentValidator::validate($invoiceId, 'invoiceId');
ArgumentValidator::validate($params, 'params');
$allowedParams = array('width' => 1, 'height' => 1, 'action' => 1);
$payLoad = "";
$json = self::executeCall("/v1/invoicing/invoices/{$invoiceId}/qr-code?" . http_build_query(array_intersect_key($params, $allowedParams)), "GET", $payLoad, null, $apiContext, $restCall);
$ret = new Image();
$ret->fromJson($json);
return $ret;
}