Networked POS rfid system

I want a system designed where one enters a restaurant and is issued a rfid card/band(both options of prepaid and postpaid) which he or she can then take to a tap of beer and dispense as much as they want and the amount they dispense is logged into the system. The tap must have a live display showing the live pour data and info about the beverage being dispensed and the tap must be enabled by swiping the rfid card which will then authenticate the user and then open a inline solenoid valve which will allow beer to be poured and then will shut off automatically after flow of beer has stopped. The pour data will be gathered by a inline flow meter which will tell the system how much has been dispensed. The system must be scaleable and be designed for commercial use so prototype boards are not to be considered. The flow sensor and meter will have to work in very cold conditions and under pressure.