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docs: 完善文档

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Fu Diwei
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docs/WechatTenpayV3/Basic_CertificateSerialNumber.md Normal file
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## 如何查看商户证书序列号？
---
> 请先自行阅读：
>
> [《微信支付开发者文档 - 证书/密钥/签名介绍：私钥和证书 - 声明所使用的证书》](https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay3_1.shtml#part-3)
>
> [《微信支付开发者文档 - 常见问题：证书相关 - 如何查看证书序列号？》](https://pay.weixin.qq.com/wiki/doc/apiv3_partner/wechatpay/wechatpay7_0.shtml#part-5)
请开发者按上面参考阅读给出的方法自行查看证书序列号。
如果你已有 CER/CRT 格式的证书文件，你也可以利用本库提供的提供的 `RSAUtility` 工具类导出证书序列号：
```csharp
string certificate = "-----BEGIN CERTIFICATE-----微信商户证书，即 `apiclient_cert.pem` 文件内容-----END CERTIFICATE-----";
string serialNumber = RSAUtility.ExportSerialNumberFromCertificate(certificate);
```