前端：
wx.requestSubscribeMessage({
  tmplIds: ['GAP8yjAX_F9SqZfWhhJ-SwgFIV-jhKLz4VXSPXjprlA'],
  success (res) {
  console.log("res:"+res)
 }
})
后端：
public void msgSend(WxSubscribeMsgRequest wxSubscribeMsgRequest) {
    
    Map<String, TemplateDataRequest> map = new HashMap<>(5);
    map.put("thing", new TemplateDataRequest("有人下单啦！"));
    wxSubscribeMsgRequest.setData(map);

    log.info("发送消息,请求参数:[{}]", JSON.toJSONString(wxSubscribeMsgRequest));
    Response<WxSubscribeMsgResponse> response = httpWechatAppApi.subscribeSend(wxSubscribeMsgRequest);
    log.info("发送消息,返回结果:[{}]", JSON.toJSONString(response));
}