KSeF and mObywatel: Logging into the system just got easier
2026-02-19
On February 14, 2026, KSeF was integrated with the National eID Node. You can now access it like other public e-services—via mObywatel, mojeID, or e-ID.
S2K Blog - Automatic Stripe to KSeF integration
Learn more about KSeF, invoice automation and Stripe integration
KSeF Lighthouse – How to Automatically Check System Status
2026-02-18
The Ministry has launched an API called KSeF Lighthouse that shows system status in real-time. Your software can automatically check if KSeF is operational.
Offline and offline24 modes in KSeF – How to issue invoices during system outages or internet problems
2026-01-29
Must issue invoices through KSeF but the system is down? From February 1, 2026, use offline24, offline, or emergency modes for different situations.
How to Connect Stripe with KSeF - A Practical Guide for Entrepreneurs
2026-01-26
Accepting Stripe payments and wondering how to handle mandatory KSeF invoices from February or April 2026? Use a middleware app to automate the entire process.
Structured Invoice – What It Is and How It Works in KSeF
2026-01-22
From February 2026, Polish companies transition to mandatory e-invoices, with structured invoices becoming key. It's not just a PDF sent by email.
KSeF Dictionary - Essential Concepts and Terms You Need to Know
2026-01-22
KSeF is not just an acronym - it's a whole world of concepts you need to know to efficiently issue electronic invoices. Check out the definitions now.
