A cleaning brush structure comprises an outer sheath mounted to the outer side of an inner sheath, and an actuating body wherein the outer sheath has an elongated positioning slot communicating with an insert hole of the inner sheath for the engagement of an insert portion of the actuating body therewith. The magnetic tape is partitioned into different kinds of zones. During transaction processing, a card type for the transaction is identified from transaction data submitted by the merchant, and the merchant-specific transaction processing parameters associated with the identified card type are used to control transaction processing.