Businesses in Belgium are required to have a Blackbox/Fiscal Data Module (FDM) registered to the Geregistreerd Kassasysteem (GKS). Customers using GKS 1.0 models will have to upgrade after June 30, 2026.

The Blackbox (also known as Fiscal Data Module or FDM) is a fiscal device that signs transactions and orders processed on a cash register system. The Blackbox is only required for businesses from the hotel, restaurant, and catering industry in Belgium that meet specific federal requirements. For more information on who is required to register with a Blackbox device, refer to the official Federale Overheidsdienst Financiën website.

GKS 2.0 models use a Local Access Network (LAN) connection and no longer require a VAT Signing Card (VSC). Once you have confirmed that you have all the required hardware and that all open orders have been finalized in Lightspeed Restaurant, you may begin setting up Blackbox.

Hardware requirements

Blackbox

Cables

Ethernet cable

Power cable

When using a Blackbox, an iPad or iPad Pro must be used as the active device for POS. Neither an iPad Mini nor an iPhone can be used as the active device.

Setting up the Blackbox

The Blackbox must have an Internet connection and be connected to the cash register to comply with GKS 2.0 regulations. In an Internet outage, the Blackbox will still be operational and temporarily store transactions on your local storage.

To connect your Blackbox, you must have an Ethernet cable and a router.

1. Plug one end of the Ethernet cable into the Blackbox.
2. Plug the other end of the Ethernet cable into your router.
3. Connect the Blackbox to a power outlet.

Configuring settings in Lightspeed Restaurant

To enable the Blackbox integration, you can only have one active device enabled at a time. All other devices must be set to passive. For more information on device settings, visit Editing POS devices.

If you haven't registered with the Federal Public Finance agency, you will need to do so before you can proceed with the Blackbox setup.

Customers already set up with FDM 1.0 will need to confirm their migration to FDM 2.0 in the Back Office before continuing with the setup steps. New customers can directly proceed with setup from the Back Office.

• FDM 1.0 customers

  1. From the navigation menu, select Business > Settings.
  2. Select the Business registration tab.
  3. Click Fiscal Data Module 2.0 (GKS 2.0) migration.
  4. Click Set up FDM 2.0.
     • The Back Office will run a check to ensure all active POS users have valid SSNs. If the check finds invalid SSNs, it will list the invalid users. If this happens, click Close and enter valid SSNs for each user in POS > Users.
  5. Ensure you have the necessary devices, have updated to the latest app version, and have no open shifts.
  6. Click Start FDM 2.0 setup.
  7. Check I have registered my business with the Federal Public Finance Service website, then click Confirm business registration.

  8. Enter your FDM production number and Authentication token, then click Next.

     

  9. Enter your POS production number (the unique number assigned to you when you registered with Lightspeed Restaurant as a Blackbox user) and Establishment number.
  10. (Optional) This setting is recommended only for customers with specific network requirements that interfere with the default FDM ID. Toggle on Use IP address for FDM communication to set a fixed IP address instead of using the default FDM ID, and enter the IP address in the provided text box.

  11. Click Confirm registration.

      

• New customers

  1. From the navigation menu, select Business > Settings.
  2. Select the Business registration tab.

  3. Click Set up FDM 2.0.

     • The Back Office will run a check to ensure all active POS users have valid SSNs. If the check finds invalid SSNs, it will list the invalid users. If this happens, click Close and enter valid SSNs for each user in POS > Users.

     

  4. Check I have registered my business with the Federal Public Finance Service website, then click Confirm business registration.

     

  5. Enter your FDM production number and Authentication token, then click Next.

     

  6. Enter your POS production number (the unique number assigned to you when you registered with Lightspeed Restaurant as a Blackbox user) and Establishment number.
  7. (Optional) This setting is recommended only for customers with specific network requirements that interfere with the default FDM ID. Toggle on Use IP address for FDM communication to set a fixed IP address instead of using the default FDM ID and enter the IP address in the provided text box.

  8. Click Confirm registration.

     

Your Blackbox has now been successfully connected to Lightspeed Restaurant and you’re ready to start recording your financial transactions.

What's next?