> For the complete documentation index, see [llms.txt](https://developers.alephee.com/v2/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers.alephee.com/v2/orders/post-methods/attach-a-document-to-an-order.md).

# Attach a document to an order

When attaching a document to an order within Alephee, the platform will send the attached document to the origin marketplace where the order was created. Some marketplaces accept only invoices. Other accepts only electronic fiscal invoices. Please, refer to next sections for more information.