# Page Not Found

The URL `introduction/authentication/how-it-works` does not exist.

You might be looking for one of these pages:
- [How it works](https://developers.cryptopay.me/guides/api-basics/authentication/how-it-works.md)
- [Creating a signature. Code samples](https://developers.cryptopay.me/guides/api-basics/authentication/code-samples.md)
- [How-to](https://developers.cryptopay.me/guides/invoices/payment-widget/how-to.md)
- [Signature](https://developers.cryptopay.me/guides/api-basics/authentication/signature.md)
- [Currency Icons](https://developers.cryptopay.me/guides/currencies/icons.md)

## How to find the correct page

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

## Tips for requesting documentation

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