good evening. reporter: iris scanning could be coming an atm near you. citigroup is one of several major banks testing a cardless approach to banking with a new vision intended to be more secure and easier to use. schedule a transaction. i select withdraw. i select the account to withdraw from. the amount i d like to withdraw and i simply hit okay and a notification informing me that the transaction is scheduled for redemption later. reporter: once the customer approaches with the mobile device, it scans the iris to verify the identity and out comes the cash. citi is in the early stages of testing. jp momorgan and chase is consideringing the technology. i have replaced all the pass words with the fingerprint i.d. it s safe. your fingerprint, it is unique and the same i would think about an iris scanner. reporter: security and convenience are key for consumers and mastercard says