https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/redpacketcover/redpacketcover.getAuthenticationUrl.html 红包封面，用接口鉴权的方式发放，服务端调用API提示，没有接口权限，返回值： {"errcode":48001,"errmsg":"api unauthorized rid: 617bc33d-743d724e-3e5b6d83"}