You know your payment card is contactless if it has the contactless indicator — four curved lines — printed somewhere on it. Most cards issued today by major banks are contactless by default, while cards with magnetic stripes for swiping are slowly being phased out entirely. Digital Transactions: Cardknox Is the Latest Player to Adopt QR Codes for Contactless Payments Cardknox Is the Latest Player to Adopt QR Codes for Contactless Payments