a process for electronic authorization to access a common account via personal identification devices such as radio frequency identification tags , such as may be mounted on a wristband . rfid wristbands for auxiliary users are not authorized by a cashier / operator unless a primary account holder &# 39 ; s rfid wristband is utilized as an immediate preceding step . this process alleviates a problem with simpler approaches which merely require operator authorization to associate auxiliary rfid wristbands with primary rfid wristbands .