合单下单

使用合单支付接口，用户只输入一次密码，即可完成多个订单的支付。目前最多一次可支持10笔订单进行合单支付。用合单下单api在微信支付服务后台生成预支付交易单，返回正确的预支付交易会话标识后再按扫码、JSAPI、APP、H5等不同场景生成交易串调起支付。 官方合单支付文档

const { Formatter, Hash } = require('wechatpay-axios-plugin')

// 合单 NATIVE 支付场景
wxpay.v2.pay.combinedorder.post({
  combine_appid,
  combine_mch_id,
  device_info,
  nonce_str,
  sign_type,
  combine_out_trade_no,
  spbill_create_ip,
  time_start,
  time_expire,
  notify_url,
  trade_type: 'NATIVE',
  product_id,
  sub_order_list,
})
.then(
  ({ 
    data: {
      return_code,
      return_msg,
      combine_appid,
      combine_mch_id,
      device_info,
      nonce_str,
      sign,
      result_code,
      err_code,
      err_code_des,
      trade_type,
      code_url,
    },
  }) => ({
    code_url,
  })
)

// 合单 JSAPI 支付场景
wxpay.v2.pay.combinedorder.post({
  combine_appid,
  combine_mch_id,
  device_info,
  nonce_str,
  sign_type,
  combine_out_trade_no,
  spbill_create_ip,
  time_start,
  time_expire,
  notify_url,
  trade_type: 'JSAPI',
  combine_openid,
  sub_order_list,
})
.then(
  ({
    data: {
      return_code,
      return_msg,
      combine_appid,
      combine_mch_id,
      device_info,
      nonce_str,
      sign,
      result_code,
      err_code,
      err_code_des,
      trade_type,
      prepay_id,
    },
  }) => {
    const nonceStr = Formatter.nonce();
    const timeStamp = '' + Formatter.timestamp();
    const packageStr = 'prepay_id=' + prepay_id;
    const signType = previousSignType;
    return { 
      appId,
      timeStamp,
      nonceStr,
      package: packageStr,
      signType,
      paySign: Hash.sign(
        signType,
        { appId, timeStamp, nonceStr, package: packageStr, signType },
        apiv2Secret
      )
    }
  }
)

// 合单 APP 支付场景
wxpay.v2.pay.combinedorder.post({
  combine_appid,
  combine_mch_id,
  device_info,
  nonce_str,
  sign_type,
  combine_out_trade_no,
  spbill_create_ip,
  time_start,
  time_expire,
  notify_url,
  trade_type: 'APP',
  scene_info,
  sub_order_list,
})
.then(
  ({
    data: {
      return_code,
      return_msg,
      combine_appid,
      combine_mch_id,
      device_info,
      nonce_str,
      sign,
      result_code,
      err_code,
      err_code_des,
      trade_type,
      prepay_id: prepayid,
    },
  }) => {
    const noncestr = Formatter.nonce();
    const timestamp = '' + Formatter.timestamp();
    const packageStr = 'Sign=WXPay';
    const signType = previousSignType || 'MD5';
    return { 
      appid,
      partnerid,
      prepayid,
      package: packageStr,
      timestamp,
      noncestr,
      sign: Hash.sign(
        signType,
        { appid, partnerid, prepayid, package: packageStr, timestamp, noncestr },
        apiv2Secret
      )
    }
  }
)

// 合单 MWEB 支付场景
wxpay.v2.pay.combinedorder.post({
  combine_appid,
  combine_mch_id,
  device_info,
  nonce_str,
  sign_type,
  combine_out_trade_no,
  spbill_create_ip,
  time_start,
  time_expire,
  notify_url,
  trade_type: 'MWEB',
  scene_info,
  sub_order_list,
})
.then(
  ({ 
    data: {
      return_code,
      return_msg,
      combine_appid,
      combine_mch_id,
      device_info,
      nonce_str,
      sign,
      result_code,
      err_code,
      err_code_des,
      trade_type,
      mweb_url,
    },
  }) => ({
    mweb_url,
  })
)