Could it be possible to have hotspots ticket with ability to log in scanning a QR code?
some customers that are using hotspot for guest's access and asked us for this feature
It is possible to create a QR code to connect the user to the SSID and provide the WPA key, but there's no mechanism inside iOS or Android to get the voucher code into the browser. There are many sites on the web that'll make a QR code for your SSID for you, just search for "QR code Wifi generator."
What hotspot feature are you using? (One on the firewall, or one of the captive portals on the Cloud managed APs?)
WatchGuard Customer Support