# Page Not Found

The URL `payment-gateway/api-version-1/callback` does not exist.

You might be looking for one of these pages:
- [Callback](https://docs.paylayercore.com/payment-gateway/api-version-4/callback.md)
- [Withdrawal](https://docs.paylayercore.com/payment-gateway/api-version-4/withdrawal.md)
- [Features](https://docs.paylayercore.com/payment-gateway/api-version-4/features.md)
- [Deposit](https://docs.paylayercore.com/payment-gateway/api-version-4/deposit.md)
- [API Version 4](https://docs.paylayercore.com/payment-gateway/api-version-4.md)

## How to find the correct page

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

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/payment-gateway/api-version-4/callback.md`)
- Use `Accept: text/markdown` header for content negotiation