The standard Fuelman "vehicle" cards are kept with the vehicle. This allows drivers to rotate, using the vehicle's card for fuel purchases.
Each driver has a unique Prompted ID which tracks that driver's purchases. It works like a PIN and can be used with any card. A Prompted ID and odometer reading are required for fuel purchases.
Your account access is through iFleet. Track, manage and control fuel expenses across multiple vehicles and drivers with your online account.