# API V7 (SDK V21) ONE store In-App支付使用指南及下载

ONE store的最新In-App支付API V7（SDK V21）上线了。                        

欢迎您使用支持更强大、更多功能的最新版本。

{% hint style="info" %}
此页面是In-App支付API V7(SDK V21)的使用指南页面，正在使用API V5或API V6的开发公司可以迁移到API V7。                                                    

If you are comfortable with English, please change the language to English from the upper right side in this page.
{% endhint %}

{% hint style="info" %}
有关One Store In-App付费 App的全球分发指南，请参考以下内容。

* [筹备全球分发](https://onestore-dev.gitbook.io/dev/chi/glb)
  {% endhint %}


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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://onestore-dev.gitbook.io/dev/chi/tools/billing/v21.md?ask=<question>
```

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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.