获取 component_access_token
        详情请参考 https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list\
        &t=resource/res_list&verify=1&id=open1419318587&token=&lang=zh_CN

        :return: 返回的 JSON 数据包

def fetch_access_token(self):
        """
        获取 component_access_token
        详情请参考 https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list\
        &t=resource/res_list&verify=1&id=open1419318587&token=&lang=zh_CN

        :return: 返回的 JSON 数据包
        """
        url = '{0}{1}'.format(
            self.API_BASE_URL,
            '/component/api_component_token'
        )
        return self._fetch_access_token(
            url=url,
            data=json.dumps({
                'component_appid': self.component_appid,
                'component_appsecret': self.component_appsecret,
                'component_verify_ticket': self.component_verify_ticket
            })
        )