Belgian FPS Finance published updated technical specifications for FDM communication as part of GKS 2.0 requirements.

On May 12, 2025, the Belgian FPS Finance released version 1.07 of the API protocol outlining communication between Fiscal Data Modules (FDMs) and the Fincloud platform, a core element of the new GKS 2.0 fiscal system. The update defines technical specifications for secure data exchange, including JSON-based transmission of fiscal or "no operation" events and mandatory confirmations from the Fincloud system.