public function getMobileApps($brandId = null, $page = 1)
    {
        $params = array(
            'method' => 'sp.mobile_app.get_list',
            'page' => $page
        );

        if (strlen($brandId) > 0) {
            $params['brand_id'] = $brandId;
        }

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