Update of API for National e-Invoice System and Taxpayer Application KSeF in Pre-production Environment (Demo)

• API Krajowego Systemu e-Faktur and Aplikacji Podatnika KSeF will be updated on the pre-production environment (Demo)
• The update will take place on November 23, 2023, from 11:00 to 21:00
• The update includes version 2.0.4 of the API Krajowego Systemu e-Faktur, which makes the tradeName field in SubjectNameType optional and optimizes invoice queries
• The update also includes version 1.4.3 of the Aplikacji Podatnika KSeF, which adds an endpoint to return the current version of the mobile application
• There may be temporary difficulties in accessing these environments 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.