Adding Poland to your product means handling two e-invoicing systems: KSeF for domestic B2B, and Peppol for public sector and cross-border. Many software vendors build them separately, with different partners. But there's a simpler way.
In Poland KSeF is not optional
Since February 2026, any product serving VAT-registered businesses in Poland needs to support KSeF, the national e-invoicing platform. If your software serves customers operating in Poland, KSeF compliance isn't optional.
But Poland's e-invoicing picture has two sides. Alongside KSeF, the Peppol network handles invoicing to Polish public sector buyers via the PEF platform and cross-border invoicing to the growing number of EU countries where Peppol is now mandatory.
If you're building Poland compliance into your product, solving both at once saves you from coming back to it later. And we can help you out with that.
Solve both KSeF and Peppol with a single API
KSeF: domestic B2B in Poland
Your customers issuing invoices to Polish companies need them to flow through KSeF in FA(3) XML format.
Maventa's API handles submission, validation, and retrieval, so your product stays in control of the invoicing flow without you building the KSeF connection from scratch.
Peppol: B2G and cross-border
One API, both covered
You don't need separate partners for both.
Connect once, and your product handles the full Polish e-invoicing picture, plus cross-border EU invoicing beyond Poland.
KSeF is the mandate, Peppol is the advantage
Entering the Polish market means dealing with KSeF, since it's mandatory for all VAT-registered businesses operating there. But stopping at KSeF alone leaves a gap: your customers will also need Peppol for invoicing Polish public sector buyers and for cross-border flows with EU trading partners.
Integrating both through the same API from the start means less rework, fewer partner relationships to manage, and a cleaner story for your customers: their invoicing, domestic and international, works inside your product.
We've been in e-invoicing since before most mandates existed
We've been a certified Peppol Access Point since Peppol's founding, and an active member of OpenPeppol. Our API is used by 300+ software partners across Europe, handling over 12 million transactions a month.
Poland is part of our network, and as e-invoicing mandates continue to roll out across Europe, we'll be keeping pace with them so you don't have to.
See how it works, start with a free test account
Open a free test account and start exploring the API in our sandbox environment. When you're ready to talk through the Poland-specific setup, KSeF, Peppol, or both, our integration team is there to help.
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Peppol API documentation
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