Cashless catering: mobile biometric swipe pods?
We have a desire to shift where possible to cashless catering, using digits as authentication (they need to lose 10 before it won't work, so more reliable than cards).
We also operate two mobile food stalls to cut down on congestion / encourage kids to eat stuff rather than skipping meals to play football.
Does a mobile product exist that can sync or cache balance info, provide biometric auth against a cached or live database and do so securely (Radius, WPA2 preferred, WPA as a fallback)?
My experience of catering systems' network stacks is that they're universally rubbish, so I'm expecting some sort of PDA + Biometric reader device. Say a modified version of the things couriers use.