# Page Not Found

The URL `authentication` does not exist.

You might be looking for one of these pages:
- [Authentication](https://docs.payscore.com/api-reference/authentication.md)
- [Sending Invites](https://docs.payscore.com/income-verification/sending-invites.md)
- [Applicant Groups](https://docs.payscore.com/api-reference/applicant-groups.md)
- [Introduction](https://docs.payscore.com/master.md)
- [Validating Webhooks](https://docs.payscore.com/webhooks/validating-webhooks.md)

## How to find the correct page

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

## Tips for requesting documentation

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