How can I issue a draft (proforma) invoice?

Consejo

Last updated on 2025-11-10.

You can issue a draft (proforma) invoice via the SIGN ES API by creating a** non-fiscal document **marked as a draft. This is applicable to simplified or complete draft invoices.

This type of document is not transmitted to the tax authorities (Verifactu or TicketBAI) and is intended for informational purposes only — for example, providing a quote or estimate before finalizing a sale.

To create a draft invoice using the SIGN ES API:

• Send a request to the Create an invoice endpoint.

• Indicate an in invoice type DRAFT

• Provide the same payload structure as for a SIMPLIFIED or COMPLETE invoice. 

For traceability purposes, we recommend that you link all invoices (simplified/complete) to the draft created beforehand (if any exists). This can be done through the draft_id field, where a uuid of the already generated draft in SIGN ES API can be provided.