发送统一服务消息的请求体：

{"touser":"oZTIT5ZF6eaOQZVtkFGhaVAYtQ2s","mp_template_msg":{"appid":"XXXX1","template_id":"c7zE76MWUG__eOeu67svHfgPv86aiypjBynxFMe9-us","url":"http://mp.weixin.qq.com","miniprogram":{"appid":"xxxx2","pagePath":"pages/order_detail/order_detail?id=34"},"data":{"first":{"value":"您好，您的订单处理成功","color":"#173177"},"keyword1":{"value":"2958554024414658560","color":"#173177"},"keyword2":{"value":"下单成功","color":"#173177"},"keyword3":{"value":"待派单","color":"#173177"},"remark":{"value":"请保持联系电话畅通，服务人员会尽快与您联系","color":"#173177"}}}}