# 常见问题

如果你对证书和证书升级有疑问，请阅读[证书相关](/wechatpay-api-v3/chang-jian-wen-ti/zheng-shu-xiang-guan.md)的问题解答。

如果你的商户签名验签不通过，不知道如何定位和解决，请阅读[签名相关](/wechatpay-api-v3/chang-jian-wen-ti/qian-ming-xiang-guan.md)的问题解答。

如果你遇到API v3密钥相关的问题，请阅读[密钥相关](/wechatpay-api-v3/chang-jian-wen-ti/api-v3-mi-yao-xiang-guan.md)的问题解答。


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://wechatpay-api.gitbook.io/wechatpay-api-v3/chang-jian-wen-ti.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.