Regulation (EU) 2022/2399 on the EU Single Window Environment for customs came into effect in December 2022. This Regulation establishes the EU customs Single Window Certificates Exchange System (EU CSW-CERTEX). Member States are obliged to connect their national Single Window Environments (SWE) for customs to the EU CSW-CERTEX by March 2025 for certain non-customs formalities. One of these non-customs formalities, as defined in Regulation (EU) 2024/573 on fluorinated greenhouse gases (F-gases), relates to the requirements for the import, export, and transit of F-gases and F-gas containing products and equipment. These formalities are processed and maintained via the F-gas Portal, which has been available for connection to the Member States' national Single Window Environment for customs via EU CSW- CERTEX since 1 January 2022. This is an eLearning module on the enforcement of the F-gas Regulation via EU CSW- CERTEX, based on the updated TARIC integration. The content of this module is aligned with the provisions of Regulation (EU) 2024/573, which were in force on 1 November 2025.​