num/cloudfunctions/createPayment/index.js

const cloud = require('wx-server-sdk');
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV });

exports.main = async (event) => {
  const { type, amount, referralCode } = event;
  const { OPENID } = cloud.getWXContext();

  try {
    const outTradeNo = `${Date.now()}_${Math.random().toString(36).slice(2, 8)}`;

    const result = await cloud.cloudPay.unifiedOrder({
      body: '数字能量学-能量师年服务包',
      outTradeNo,
      spbillCreateIp: '127.0.0.1',
      subMchId: 'YOUR_SUB_MCH_ID',
      totalFee: Math.round(amount * 100),
      envId: 'YOUR_CLOUD_ENV_ID',
      functionName: 'paymentCallback',
    });

    return { code: 0, payment: result.payment };
  } catch (err) {
    return { code: 500, error: err.message };
  }
};