A method for authorizing return of a purchase by a customer to a merchant by an interaction of a customer chip card upon which a customer transaction history is stored and a merchant POS terminal upon which predetermined data is stored, the method comprising the steps of, (a) reading at least part of the customer transaction history from the customer chip card, (b) comparing the part of the customer transaction history read from the customer chip card with the predetermined data, and (c) issuing to the merchant a message from the POS terminal based upon the outcome of the comparison.