https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/customer-message/customerServiceMessage.send.html

{     "xml": {         "return_code": "FAIL",         "return_msg": "mch_idå\u008f\u0082æ\u0095°é\u0095¿åº¦æ\u009c\u0089误"     } }