public function getSessionKey($jsCode)
    {
        $params = [
            'appid' => $this->config['app_id'],
            'secret' => $this->config['secret'],
            'js_code' => $jsCode,
            'grant_type' => 'authorization_code',
        ];

        return $this->parseJSON('GET', [self::JSCODE_TO_SESSION, $params]);
    }