小程序微信支付偶现报错user code exception caught，代码如下，求大佬帮看看？

const cloud = require('wx-server-sdk')cloud.init({  env: "zs-redpackage-0gbq2222433377t1200b6fd})function randomString(e) {      e = e || 32;  var t = "ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678",  a = t.length,  n = "";  for (i = 0; i < e; i++) n += t.charAt(Math.floor(Math.random() * a));  return n}const wxContext = cloud.getWXContext()exports.main = (event, context) => {  const timeStamp = new Date().getTime()  const randomSix = randomString(6)  const outTradeNo = `${randomSix}${timeStamp}`  return new Promise((resolve, reject) => {    cloud.cloudPay.unifiedOrder({      "functionName": "pay_cb",      "envId": 'zs-redpackage-0gbq2222433377t1200b6fd',      "subMchId": "1606636452",      "nonceStr": randomString(),      "body": event.name,      "detail": event.name,      "outTradeNo": outTradeNo,      "totalFee": event.price * 100,      "spbillCreateIp": "221.181.214.198",      "tradeType": "JSAPI",      "openid": wxContext.OPENID,      "subOpenid": wxContext.OPENID,    }).then(res => {      if (res.returnCode === 'SUCCESS') {        resolve({          success: 1,          ...res,          body: event.name,          detail: event.name,          totalFee: event.price,          timeStamp: timeStamp,          outTradeNo: outTradeNo        })      } else {        reject({          success: 0,          ...res        })      }    }).catch(err => {      reject(err)    })  })}