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

## ONE store的最新In-App支付API V7（SDK V21）上線了。                        

歡迎您使用支援更强大、更多功能的最新版本。

{% hint style="info" %}
此頁面是In-App支付API V7(SDK V21)的使用指南頁面，正在使用API V5或API V6的開發公司可以遷移到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" %}
有關One Store In-App付費 App的全球發布指南，請參考以下内容。

* [籌備全球發布](/dev/cht/glb.md)
  {% 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/cht/tools/billing/v21.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.