Update of National e-Invoice System API on Test Environment on March 21, 2024 at 10:00.

• Update of the API of the National e-Invoice System on the test environment
• The update is planned for March 21, 2024, from 10:00 on the test environment
• The update includes UPO on demand and support for PEF invoices
• Temporary difficulties in accessing the environment may occur during the update
• Apologies for any inconvenience caused

Source: podatki.gov.pl

Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.