12.12微信小程序云调用购买

const cloud = require('wx-server-sdk');
cloud.init();

exports.main = async (event, context) => {
  const { openid, totalFee } = event;
  const res = await cloud.cloudPay.unifiedOrder({
    openid,
    totalFee: totalFee * 100, // 单位为分
    body: '商品描述',
    outTradeNo: '订单号', // 商户自定义订单号
    spbillCreateIp: '用户IP地址',
    notifyUrl: '支付回调地址',
    tradeType: 'JSAPI'
  });

  return res;
};

wx.cloud.callFunction({
  name: 'createOrder',
  data: {
    openid: '用户openid',
    totalFee: 100 // 单位为元
  },
  success: res => {
    const { timeStamp, nonceStr, packageValue, signType, paySign } = res.result;
    wx.requestPayment({
      timeStamp,
      nonceStr,
      package: packageValue,
      signType,
      paySign,
      success: () => {
        console.log('支付成功');
      },
      fail: () => {
        console.log('支付失败');
      }
    });
  },
  fail: err => {
    console.error('创建订单失败', err);
  }
});