Wechat jsapi payment pit summary

1. Different payment scenarios

https://pay.weixin.qq.com/wiki/doc/apiv3/index.shtml

What we do is embed the web page in the official account , Call wechat payment . So the choice is JSAPI

2. signType The problem of inconsistency

At the beginning of the query , In the documents issued by the product signType yes md5. But I saw it on the official website signType yes RSA. This is because of the wechat 2 A version ：v2 and v3

https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay-1.shtml

v2 Support HMAC-SHA256 and MD5, Below v2 JSAPI Documents
https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6

v3 Support RSA, Below v3 JSAPI Documents
https://pay.weixin.qq.com/wiki/doc/apiv3/apis/chapter3_1_4.shtml

We've done it before app Wechat payment , For interface compatibility , therefore JSAPI Also used v2 edition

3. Angular call WeixinJSBridge

Angular call WeixinJSBridge, Prompt name not found , Compilation fails ？
https://developers.weixin.qq.com/community/develop/doc/000e062d098200b9d549cad3d51c00

4. The payment scenario is illegal

Because all I did at first was app Wechat payment of , So you need to add support JSAPI Transactions type （trade_type）

https://blog.csdn.net/SEA_mihu/article/details/107684206

https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=4_2

5. Multi micro signal processing

Because in the beginning app When calling wechat payment , A wechat official account for collection
Now it is a new micro signal . The solution is to 2 Get one of every micro signal Wechat payment merchant number above

6. Payment verification signature failed

6.1 Routine solution

Wechat official has a post about failed payment verification signature ：https://developers.weixin.qq.com/community/develop/doc/000cc4ffa2c2083e565b4dabe5fc09

Payment verification signature failed , The problem for most people is Inconsistent signatures , Parameter case problem, etc . But we are unified md5, Parameters are copied directly from the document , Writing is definitely not What's the problem? .

There are others. , Reset required key, Because if we reset here , May lead to app There is a problem with your payment , So it is not easy to try this .

6.2 Second signature

Later, I checked a lot of information . I found many people saying Second signature , Because I returned directly from the backstage sign { "package": "Sign=WXPay", "appid": "wx666", "sign": "7E9360EE36", "partnerid": "1116401", "prepayid": "wx66000", "noncestr": "345332", "timestamp": "1625620895" } , What I did at that time was to take these parameters returned from the background Call wechat payment directly after formatting ：
https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6

So I didn't pay much attention to the problem of secondary signature . But it always prompts that the signature fails , Later I found this 3 This article says https://www.cnblogs.com/6324/p/10281798.html

https://developers.weixin.qq.com/community/develop/article/doc/00088264e006f0cc423c1732d5b413

https://developers.weixin.qq.com/community/develop/doc/000ca273cf0ef8348f6c868c55b800?highLine=%25E6%2594%25AF%25E4%25BB%2598%25E9%25AA%258C%25E8%25AF%2581%25E7%25AD%25BE%25E5%2590%258D%25E5%25A4%25B1%25E8%25B4%25A5

Lenovo communicated with the backstage before , Then I realized . This sign yes Need to put appId , timeStamp, nonceStr,package, signType 5 Parameter splicing key in the future Reuse md5 Encrypted . The previous interface returns sign Because it is for app Call the... Used by wechat payment , therefore sign Encryption method and JSAPI Not the same . So the verification fails all the time

6.3 Sand sculpture document

Looking back ,v2 JSAPI Payment documents It does say , Yes 5 Parameters are encrypted , And it is marked with case attention

But in the signature algorithm that jumps from the document to the past , https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=4_3 Signature algorithm demo There are some other parameters , and appid Also lowercase .

And in the signature verification tool ,https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=20_1 appid Or lower case

From the signature algorithm documentation and verification signature tool here , Basically and JSAPI Adjust the sentence "pay" " Parameters need to be re signed " It doesn't correspond to .

6.4 Debugging tips

① Use the signature verification tool (https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=20_1) Quickly generate sign

② Create a new one index.html hold JSAPI Of demo code copy go in .
At the same time, we need to put ① The parameters and from ① Got sign Replace here .

③ Go online directly index.html Just test it out