# Page Not Found

The URL `api/custom-token-authentication` does not exist.

You might be looking for one of these pages:
- [Customizing the Icons](https://chat-sdk.gitbook.io/android/api/customizing-the-icons.md)
- [Message Customization](https://chat-sdk.gitbook.io/android/api/message-customization.md)
- [Tab Customization](https://chat-sdk.gitbook.io/android/api/tab-customization.md)
- [Overriding the Push Notification Handler](https://chat-sdk.gitbook.io/android/api/overriding-the-push-notification-handler.md)
- [Add a Chat Option](https://chat-sdk.gitbook.io/android/api/add-a-chat-option.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://chat-sdk.gitbook.io/android/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://chat-sdk.gitbook.io/android/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/android/api/customizing-the-icons.md`)
- Use `Accept: text/markdown` header for content negotiation