public function sendPushMessageToUser(TypeInterface $message, $openID)
    {
        $this->client->send(
            new Request(
                "POST",
                "https://api.weixin.qq.com/cgi-bin/message/custom/send",
                [],
                json_encode(
                    (new Formatter())->formatMessageForPush($message, $openID)
                )
            )
        );
    }