The Ministry of Finance published an updated API for the test environment in KSeF (National E-Invoicing System) which supports both FA(1) and FA(2) schemas. From July to August 2023, both schema versions, meaning both FA(1) and FA(2), will apply in the KSeF test environment. The official announcement can be found here: API KSeF dla środowiska testowego przystosowane do struktur FA(1) i FA(2) – Ministerstwo Finansów – Portal Gov.pl (www.gov.pl)
You can find more information about the updated FA(2) schema and the implementation timeline here.
