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KSeF integration without retyping invoices and without changing your software.

We connect your online store, ERP or custom system to KSeF, Poland’s National e-Invoicing System. Sales invoices are sent automatically, the KSeF number and UPO receipt come back to your system, and purchase invoices are downloaded automatically.

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Time to launch
usually 2–5 weeks
Price
from PLN 3,900 net
Scope
sending and receiving e-invoices
Systems
online stores, ERP, in-house systems

How we approach it

KSeF is mandatory, yet many companies still issue invoices in software that can’t connect to it, or retype them by hand. An integration through the KSeF API sends invoices from your system to KSeF automatically, in the correct FA(3) structure, and the KSeF number comes back to the document.

We don’t replace the software your team is used to. We add the missing connection: in your store, in a custom system, in an ERP without a ready-made module, or as a separate gateway for several systems at once. You see every validation error immediately, with a description of what to fix.

  • Online store

    WooCommerce, Shopify, PrestaShop or a custom store: the invoice for an order goes to KSeF with no human involved.

  • ERP and custom systems

    A KSeF module for a system that doesn’t have one, with sending, statuses and downloading of purchase invoices.

  • Gateway for several systems

    One place through which several programs or companies send and receive e-invoices.

  • Purchase invoices

    Downloading purchase invoices from KSeF, reading the data and passing it on for approval and to accounting.

What the service covers

We agree the scope in a workshop. These are the elements that most often end up in the project.

  • Sending e-invoices

    An XML file in the FA(3) structure, sent to KSeF, with the KSeF number and UPO saved with the document.

  • Receiving purchase invoices

    Regular downloading of purchase invoices from KSeF, with preview, search and handover to accounting.

  • Statuses and errors

    A sending queue, retries when KSeF is unavailable and clear validation error messages.

  • Authentication and permissions

    Handling of KSeF tokens and certificates, plus permissions for staff and your accounting firm.

  • Emergency and offline mode

    Handling of KSeF offline mode and outages as the regulations require, with invoices sent on time once it’s back.

  • Invoice visualisation with a QR code

    A clear invoice PDF with the KSeF number and a QR code for customers who don’t use KSeF.

Packages and prices

Starting prices, excluding VAT. We give you the exact amount after a free call, split into stages with a deadline for each.

  • Store or simple system

    from PLN 3,900 net

    2–3 weeks

    • sales invoices sent to KSeF
    • KSeF number and UPO saved with the order
    • queue, errors and retries
    • invoice PDF with a QR code
    • a guide for your team
    Get a quote
  • Most popular

    Full integration

    from PLN 9,900 net

    3–5 weeks

    • sending and receiving e-invoices
    • purchase invoices for approval
    • permissions and tokens for your team
    • offline and emergency mode
    • a report of sends and errors
    Get a quote

  • KSeF gateway

    from PLN 19,900 net

    5–8 weeks

    • one gateway for several systems or companies
    • an API for your software
    • AI reading of purchase invoices
    • integration with ERP and accounting
    • monitoring and support
    Get a quote

How an invoice goes through KSeF

Your team issues invoices just as before. The integration does the rest, and you see the status of every document.

  1. 1

    You issue an invoice

    In your store, ERP or own system, just as before.

  2. 2

    Sent to KSeF

    The integration creates the FA(3) file and sends it through the KSeF API.

  3. 3

    KSeF number and UPO

    KSeF accepts the invoice and issues a number and a receipt.

  4. 4

    Status in your system

    The number and status come back to the document, and you see any errors immediately.

  5. 5

    Purchase invoices

    Supplier invoices download automatically for approval and accounting.

Industries we build for

We build for companies in every industry, and in these we have ready-made modules and working examples.

Frequently asked questions

How much does a KSeF integration cost?

Sending invoices from a store or simple system to KSeF costs from PLN 3,900 net. A full integration with purchase invoice download, permissions and emergency mode is usually from PLN 9,900, and a KSeF gateway for several systems from PLN 19,900 net.

My software doesn’t support KSeF. Do I have to replace it?

No. We add the integration to your system or build a separate gateway that takes invoices from your software and sends them to KSeF.

What if KSeF is down?

The integration has a queue and supports emergency modes: invoices are saved and, once KSeF is back, sent within the deadline the regulations require.

Will my accounting firm have access?

Yes. We set up KSeF permissions for your accounting firm and staff, and purchase invoices can go to accounting automatically.

How long does it take to launch?

Sending invoices from a store usually takes 2–3 weeks, a full ERP integration 3–5 weeks. We start by testing in the KSeF test environment before anything goes to production.

Other services

Tell us about your project.

The first hour-long call is free. Afterwards you get a summary with our conclusions and a ballpark quote, even if we don’t end up working together.

Book a free consultation