收付通合单代扣签约成功通知(JSON)
签约、解约成功后(包含用户主动解约),微信会把相关签约、解约信息异步通知给商户。签约结果通知路径为【APP方式预签约】接口商户上传的notify_url字段。 官方文档
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)
json
{
"id":"EV-2018022511223320873",
"create_time":"20180225112233",
"resource_type":"encrypt-resource",
"event_type":"ECOMMERCE_ENTRUST.SIGN",
"summary": "签约结果通知",
"resource" : {
"algorithm":"AEAD_AES_256_GCM",
"ciphertext": "...",
"nonce": "...",
"associated_data": ""
}
}
resource.ciphertext 解密后的明文格式
json
{
"mchid": "1230000109",
"out_contract_code": "wxwtdk20200910100000",
"plan_id": 12535,
"appid": "wxd678efh567hg6787",
"openid" : "o-MYE42l80oelYMDE34nYD456Xoy",
"contract_expired_time":"2021-05-20T13:29:35.120+08:00",
"operate_time":"2020-05-20T13:29:35.120+08:00"
}
处理程序
js
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 {
mchid,
out_contract_code,
plan_id,
appid,
openid,
contract_expired_time,
operate_time,
} = 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)
json
{
"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。
- 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)