Abstract: A high speed, computer controlled banking machine provides fully automatic teller stations for completing banking functions in response to a coded credit card presented thereto. After the credit card presented to the machine has been initially checked to determine if the card has the proper format, coded information thereon is evaluated to check the user's identity prior to authorizing him to complete a selected banking function. When each of several standard checks of the credit card code have been completed, a check is made of a bank interchange file to determine if the presented card will be honored at a particular station. Upon a satisfactory response at the interchange check, a bad account verification is made to determine if the accounts encoded on the card are delinquent in any respect.