public function getOrderDetails($orderId)
    {
        if (is_null($orderId) || $orderId == '') {
            throw new Exception('The orderId is required to get the details or an order.');
        }

        $params = array(
            'method' => 'sp.order.get_details',
            'order_id' => $orderId
        );

        return $this->_makeApiRequest($params);
    }