# Page Not Found

The URL `api/e-invoice-api/incoming-invoices/save-the-incoming-invoice-as-a-return-invoice` does not exist.

You might be looking for one of these pages:
- [Save the Purchase Invoice as a Return Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/save-the-purchase-invoice-as-a-return-invoice.md)
- [Returns Incoming Invoice Statistics](https://developer.nilvera.com/en/api/e-invoice-api/statistics/returns-incoming-invoice-statistics.md)
- [Send the Invoice via Email](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/send-the-invoice-via-email.md)
- [Get the HTML of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/sale-invoices/get-the-html-of-the-invoice.md)
- [Get the XML of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/sale-invoices/get-the-xml-of-the-invoice.md)

## How to find the correct page

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

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/en/api/e-invoice-api/purchase-invoices/save-the-purchase-invoice-as-a-return-invoice.md`)
- Use `Accept: text/markdown` header for content negotiation