Software developers: how to comply with Verifactu before July 29?

Camille Mendonça

Fiscalization Expert Spain

5/28/20253 min read

Camille focuses on the Spain market as Marketing & PR Manager. With an eye for storytelling, she specializes in simplifying fiscal topics around TicketBAI, Veri*Factu, and e-invoicing, to foster transparency and compliance in an engaging way.

In Spain, invoicing, POS and ERP software vendors must adapt their systems to comply with the Anti-Fraud Law and Verifactu requirements before July 29, 2025. With the deadline quickly approaching, how can software be adapted easily, without rewriting code, and avoid penalties?

SIGN ES: the Verifactu API connected to the Tax Agency, now in PROD LIVE

Good news! Our SIGN ES API is now live in production (PROD LIVE), directly connected to the Spanish Tax Agency. This means you can already start issuing Verifactu-compliant invoices, which are signed and include the required QR code.

What does this mean for software developers?

This update not only allows developers to adapt their software in time, but also means our API is ready to:

Issue fully compliant invoices
Handle batch transmissions
Fix erroneous invoices easily
Send invoices to multiple recipients

If you’re a software provider, integrating SIGN ES allows you to go live in Verifactu production right away for your clients.

Clear documentation and Responsibility Declaration: all ready

At fiskaly, we make fiscal compliance easy. Along with the API, we provide a detailed model of the Tax Agency's required Responsibility Declaration, plus all the technical documentation you need for a smooth, surprise-free integration.

A Verifactu API built for developers

SIGN ES is easy to integrate, without the need to rewrite your software code. It’s designed specifically for invoicing, POS, or ERP software developers, backed by a team of fiscal compliance experts.

One API integration, multiple benefits

SIGN ES is the only API in the market that enables compliance with both Verifactu and TicketBAI, as well as future Spanish fiscal regulations through a single integration, with no additional development needed. You’ll save time, costs, and effort, with a certified fiscal partner (ISO27001 and ISO9001) who follows strict security and data privacy standards.

Why comply with Verifactu now? Lead the way with SIGN ES

Gain time to test, integrate, and deploy without stress
Avoid last-minute errors that could result in penalties
Position yourself as a reliable, compliant vendor before July 29

Ready to comply with Verifactu?

Don’t wait until the last minute. With SIGN ES, you can go live in production today. Get started now with a fast, reliable, and expert-built solution.