webPOS 4.0
Module KSeF
central communication with the tax administration
KSeF (National System of e-Invoices) is the platform of the Ministry of Finance, used for issuing and circulating structured invoices. The system is mandatory and requires that all invoices be issued in XML format in accordance with a specified schema. Every document goes into KSeF, where it receives a reference number and a confirmation of acceptance (UPO).

How our integration with KSeF works?
Unlike many other solutions, only our IntegratorPOS is directly connected to KSeF.
The workflow is as follows:
- Issuing an invoice – the user issues a sales document in WebPOS.
- Centralization in the Integrator – the invoice immediately goes to IntegratorPOS, which serves as the central communication point.
- Preparation and sending – the Integrator converts the document into the required XML format and sends it to KSeF.
- Status and UPO – the Integrator retrieves processing statuses and the Official Confirmation of Receipt, then stores them in the system.
- Archiving and reporting – all data (invoice, status, UPO) are available in one place – in the Integrator.
Why communication via IntegratorPOS is a better solution
- Fewer connections with KSeF – instead of hundreds or thousands of sales points connecting individually to KSeF, communication happens only through IntegratorPOS.
- A single communication log – a full history of data exchange with KSeF is available centrally, which facilitates audits and diagnostics.
- Security – certificates and authorization are maintained in one place (the Integrator), which minimizes the risk of errors and abuse.
- Easier maintenance – any updates to KSeF protocols only affect the Integrator, not every WebPOS station.
- Scalability – regardless of the number of stores and terminals, traffic to KSeF is consolidated at one point.
Features of the KSeF module
- Automatic sending of invoices from WebPOS to KSeF via IntegratorPOS.
- Handling of UPO – downloading and archiving official confirmations of receipt.
- Status monitoring – full insight into whether an invoice was accepted, rejected, or is awaiting verification.
- Central logs – one consistent communication journal for the entire network of stores.
- Secure transmission – encrypted connections, certificates, and authorization centralized in the Integrator.