> For the complete documentation index, see [llms.txt](https://storeberry-docs.gitbook.io/user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://storeberry-docs.gitbook.io/user-guide/common-settings/1.8-fu-kuan-diao-zheng.md).
# 1.8 付款調整
商家可透過此功能，為特定的付款方式設定附加費或專屬折扣。請前往後台**「設定」→「付款調整」並點擊「新增」。**
於設定介面中，您可以自訂調整名稱、選擇適用的商店、綁定適用的付款方式（如 Mastercard），並彈性選擇以「百分比」或「固定金額」來計算調整率。設定完成並點選「新增」後，系統將於顧客結帳時自動計算該筆費用。
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## 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, and the optional `goal` query parameter:
```
GET https://storeberry-docs.gitbook.io/user-guide/common-settings/1.8-fu-kuan-diao-zheng.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
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.