A method for registering biometric information for use in a transponder-reader system is disclosed. The method includes steps of detecting, verifying and storing a proffered biometric sample. During detecting, a sensor detects a proffered biometric to obtain a biometric sample. During the verifying step, the biometric sample is compared with other stored samples and/or other information. During the storing step, the biometric sample is stored on a database, for use by the transponder-reader system in authorizing transactions.