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扣费状态变化通知(JSON)

扣费状态变化后,微信会把扣费状态信息发送给商户。 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":"2015-05-20T13:29:35+08:00",
  "resource_type":"encrypt-resource",
  "event_type":"DISCOUNT_CARD.USER_PAID",
  "resource" : {
    "algorithm":"AEAD_AES_256_GCM",
    "ciphertext": "...",
    "nonce": "...",
    "associated_data": ""
  }
}
resource.ciphertext 解密后的明文格式
json
{
  "openid": "oUpF8uMuAJ2pxb1Q9zNjWUHsd",
  "card_id": "233bcbf407e87789b8e471f251774f95",
  "card_template_id": "87789b2f25177433bcbf407e8e471f95",
  "out_card_code": "6e8369071cd942c0476613f9d1ce9ca3",
  "appid": "wxd678efh567hg6787",
  "mchid": "1230000109",
  "state": "ONGOING",
  "unfinished_reason": "DUE_TO_QUIT",
  "total_amount": 1000,
  "pay_information": {
    "transaction_id": "1009660380201506130728806387",
    "pay_state": "PAYING",
    "pay_amount": 100,
    "pay_time": "2015-05-20T13:29:35.12+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
:
event_create_time
,
resource_type
,
event_type
,
resource
: {
ciphertext
,
nonce
,
associated_data
}, } =
JSON
.
parse
(
json
)
const {
openid
,
card_id
,
card_template_id
,
out_card_code
,
appid
,
mchid
,
state
,
unfinished_reason
,
total_amount
,
pay_information
,
} =
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。
  • 商户退款完成后,微信会把相关退款结果和用户信息发送给清算机构,清算机构需要接收处理后返回应答成功,然后继续给异步通知到下游从业机构。
  • 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。 (通按照一定的频率重试,最多重试9次。)

Released under the MIT License. (SITEMAP)