# Page Not Found

The URL `introduction/callbacks` does not exist.

You might be looking for one of these pages:
- [Channel payment callbacks](https://developers.cryptopay.me/guides/channels/callbacks.md)
- [Invoice callbacks](https://developers.cryptopay.me/guides/invoices/callbacks.md)
- [Coin Withdrawal callbacks](https://developers.cryptopay.me/guides/payouts/callbacks.md)
- [Callbacks](https://developers.cryptopay.me/guides/api-basics/callbacks.md)
- [Email billing callbacks](https://developers.cryptopay.me/guides/email-billing/email-billing-callbacks.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/channels/callbacks.md`)
- Use `Accept: text/markdown` header for content negotiation