What is CLSS?

CLSS most likely refers to contactless EMV chip card transactions. EMV (Europay, Mastercard, and Visa) chip cards are credit and debit cards with an embedded microchip that enhances security. CLSS signifies a contactless payment where the cardholder taps their card on a compatible point-of-sale (POS) terminal instead of swiping or inserting it. This facilitates faster and more convenient transactions.