On September 30, 2025, the Ministry of Finance released the test (integration) environment for the KSeF 2.0 API programming interface.
This open testing phase allows financial and accounting system providers to verify how their software interacts with the National e-Invoice System, ensuring readiness for mandatory compliance. The Ministry of Finance provides technical support for users of the test environment through an online application form.
Entities integrating with the KSeF 2.…