# Page Not Found

The URL `use-cases/for-developers/api-version-9` does not exist.

You might be looking for one of these pages:
- [API Version 9](https://docs.phptravels.com/support/for-developers/api-version-9.md)
- [Database Architecture](https://docs.phptravels.com/support/for-developers/database-architecture.md)
- [Adding Payment Gateway](https://docs.phptravels.com/support/for-developers/adding-payment-gateway.md)
- [For Developers](https://docs.phptravels.com/support/for-developers.md)
- [Routing System](https://docs.phptravels.com/support/for-developers/routing-system.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://docs.phptravels.com/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://docs.phptravels.com/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/support/for-developers/api-version-9.md`)
- Use `Accept: text/markdown` header for content negotiation