查看证书序列号

引用：https://wechatpay-api.gitbook.io/wechatpay-api-v3/chang-jian-wen-ti/zheng-shu-xiang-guan

https://myssl.com/cert_decode.html

# 查看证书序列号openssl x509 -in apiclient_cert.pem -noout -serial 

微信支付java

<dependency><groupId>com.github.wechatpay-apiv3</groupId><artifactId>wechatpay-apache-httpclient</artifactId><version>0.4.7</version>
</dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.80</version>
</dependency>

引用：https://blog.csdn.net/T_2021_7_10/article/details/132276992
https://pay.weixin.qq.com/docs/merchant/apis/mini-program-payment/mini-prepay.html

小程序登录：https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/login.html