public function senders() 
    {
        $url = self::HOST . self::SENDERS;
        $params = $this->get_default_params();
        $result = $this->request($url, $params);
        $result = explode("\n", rtrim($result));

        $response = array(
            'code' => $result[0],
            'senders' => $result
        );
        unset($response['senders'][0]);
        $response['senders'] = array_values($response['senders']);

        return $response;
    }