> For the complete documentation index, see [llms.txt](https://help.citrusad.com/retail-media-interface/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.citrusad.com/retail-media-interface/integration/ja/brand-pages/brand-page-retailer-integration-guide/authentication-1.md).

# 認証

Brand Pagesは Epsilon RMNプラットフォームと同じAPIキーを使用します。個別キーは不要です。

リクエストには、 `Authorization` ヘッダーを含める必要があり、HTTP Basic認証を使用し、Request for Comments (RFC) 仕様に従ってAPIキーが符号化されます:

```apache
/Authorization: Basic base64(<apiKey>:)
```

上記のRFC定義形式に加えて、プラットフォームは、既存のクライアント統合との互換性のために既存のAPIキー値を直接 `Authorization`ヘッダーに渡すこともサポートしています。

```apache
Authorization: Basic \<existing_api_key>
```

<br>


---

# 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://help.citrusad.com/retail-media-interface/integration/ja/brand-pages/brand-page-retailer-integration-guide/authentication-1.md?ask=<question>&goal=<endgoal>
```

`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.