# Page Not Found

The URL `api/e-invoice-api/incoming-invoices/retrieve-envelope-information-with-ettn-number-for-the-invoice` does not exist.

You might be looking for one of these pages:
- [Retrieve Envelope Information with ETTN Number for the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-envelope-information-with-ettn-number-for-the-invoice.md)
- [Retrieves Envelope Information with the ETTN Number of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/sale-invoices/retrieves-envelope-information-with-the-ettn-number-of-the-invoice.md)
- [Retrieve Tag Information of the Draft Invoice](https://developer.nilvera.com/en/api/e-invoice-api/draft-invoices/retrieve-tag-information-of-the-draft-invoice.md)
- [Retrieve Status Information of the Purchase Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-status-information-of-the-purchase-invoice.md)
- [Retrieve Tag Information of the Invoice](https://developer.nilvera.com/en/api/e-invoice-api/purchase-invoices/retrieve-tag-information-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/retrieve-envelope-information-with-ettn-number-for-the-invoice.md`)
- Use `Accept: text/markdown` header for content negotiation