You can change the QR code displayed on the charger screen remotely via Fuuse.
First, navigate to the charger on Fuuse, then scroll down and click the "Access" option in the middle menu bar:
Scroll down to the bottom of the screen and you will see the Fuuse QR code URL for that charger:
Copy this URL, then click on "Actions" and "Change Settings" at the top of the screen to get into the charger configuration. Scroll down until you get to the QR0 and QR1 fields and paste that new Fuuse URL in, then click "Change" to save:
The QR codes should then update on the screens. For dual socket charger QR0 will be socket 1 and QR1 will be socket 2 (they will have different QR URLs).