校园轻松付扣费失败通知(JSON)

扣费后，微信后台会把相关确认结果和订单信息发送给商户，商户需要接收处理该消息，并返回应答。 扣费结果通知

请求头(headers)

Wechatpay-Nonce: 3d980fb850fdce97f6bfb3d248597f16
Wechatpay-Serial: 7132d72a03e93cddf8c03bbd1f37eedf********
Wechatpay-Signature: i48r5y8IQw1qpTO+ywoV...
Wechatpay-Signature-Type: WECHATPAY2-SHA256-RSA2048
Wechatpay-Timestamp: 1710048759
Request-ID: 08F78BB5AF0610D302189F99DD5C20BA56F89845-0

请求报文(body)

{
  "id":"EV-2018022511223320873",
  "create_time":"2015-05-20T13:29:35+08:00",
  "resource_type":"encrypt-resource",
  "event_type":"TRANSACTION.INDUSTRY_FAILED",
  "resource" : {
    "algorithm":"AEAD_AES_256_GCM",
    "ciphertext": "...",
    "nonce": "...",
    "associated_data": ""
  }
}

resource.ciphertext 解密后的明文格式

{
  "mchid": "1230000109",
  "appid": "wx8888888888888888",
  "sub_mchid": "1900000109",
  "sub_appid": "wx8888888888888888",
  "out_trade_no": "201407033233368018",
  "transaction_id": "25012014070332333018",
  "trade_type": "AUTH",
  "trade_state": "PAY_FAIL",
  "trade_state_desc": "支付成功",
  "bank_type": "ICBC_DEBIT",
  "attach": "自定义数据",
  "success_time": "2020-03-26T10:43:39+08:00",
  "payer": {
    "openid": "oUpF8uMuAJOM2pxb1Q",
    "sub_openid": "oUpF8uMuAJOM2pxb1Q"
  },
  "amount": {
    "total": 888,
    "payer_total": 888,
    "discount_total": 100,
    "currency": "CNY"
  },
  "device_info": {
    "device_id": "12343232",
    "device_ip": "123.12.12.123"
  },
  "promotion_detail": [
    {
      "coupon_id": "109519",
      "name":"单品惠-6",
      "scope":"GLOBALSINGLE",
      "type":"DISCOUNTCOUPON",
      "amount": 5,
      "stock_id": "931386",
      "wechatpay_contribute":100,
      "merchant_contribute":100,
      "other_contribute":100
	  }
  ]
}

处理程序

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

const {
  'wechatpay-nonce': wechatpayNonce,
  'wechatpay-serial': wechatpaySerial,
  'wechatpay-signature': wechatpaySignature,
  'wechatpay-timestamp': wechatpayTimestamp,
} = headers

let code = 'SUCCESS', message = undefined

if (Math.abs(Formatter.timestamp() - wechatpayTimestamp) > MAXIMUM_CLOCK_OFFSET) {
  code = 'FAIL'
  message = 'Over clock offset'
}
else
if (!Object.hasOwn(platformCertificates, wechatpaySerial)) {
  code = 'FAIL'
  message = 'platform certificate not exists'
}
else
if (!Rsa.verify(
  Formatter.joinedByLineFeed(wechatpayTimestamp, wechatpayNonce, json),
  wechatpaySignature,
  platformCertificates[wechatpaySerial]
)) {
  code = 'FAIL'
  message = 'sign mismatched'
}

// do your business
// ...
// ...

const {
  id,
  create_time,
  resource_type,
  event_type,
  resource: {
    ciphertext,
    nonce,
    associated_data
  },
} = JSON.parse(json)

const {
  transaction_id,
  mchid,
  trade_state,
  bank_type,
  success_time,
  payer,
  out_trade_no,
  appid,
  trade_state_desc,
  trade_type,
  attach,
} = JSON.parse(Aes.AesGcm.decrypt(nonce, apiv3Key, ciphertext, associated_data))

// do your business
// ...
// ...

const response = { code, message }

正常应答头(headers)

Status: 200

正常应答报文(body)

{
  "code": "SUCCESS"
}

注意：

• 同样的通知可能会多次发送给商户系统。商户系统必须能够正确处理重复的通知。 推荐的做法是，当商户系统收到通知进行处理时，先检查对应业务数据的状态，并判断该通知是否已经处理。如果未处理，则再进行处理；如果已处理，则直接返回结果成功。在对业务数据进行状态检查和处理之前，要采用数据锁进行并发控制，以避免函数重入造成的数据混乱。
• 如果在所有通知频率后没有收到微信侧回调，商户应调用查询订单接口确认订单状态。
• 特别提醒：商户系统对于开启结果通知的内容一定要做签名验证，并校验通知的信息是否与商户侧的信息一致，防止数据泄露导致出现“假通知”，造成资金损失。
• 用户支付完成后，微信会把相关支付结果和用户信息发送给商户，商户需要接收处理该消息，并返回应答。
• 对后台通知交互时，如果微信收到商户的应答不符合规范或超时，微信认为通知失败，微信会通过一定的策略定期重新发起通知，尽可能提高通知的成功率，但微信不保证通知最终能成功。（通知频率为15s/15s/30s/3m/10m/20m/30m/30m/30m/60m/3h/3h/3h/6h/6h - 总计 24h4m）