A transponder-reader transaction completion system includes a Radio Frequency (RF) operable reader for interrogating a RF operable transaction device via RF communication, wherein the transaction device is operable to provide an account number in ISO/IEC 7816 magnetic stripe Track1/Track 2 format to the RF reader via RF communication. The RF reader is additionally operable to provide an account number in ISO/IEC 7816 magnetic stripe Track1/Track 2 format to a merchant system for use in transaction completion.