Simply hold your hand near a contactless terminal and wait for the transaction to process Use the correct Knock-to-Pay (K2P) method: Hold your hand in a fist as if knocking on a door. Gently tap or hover your fist near the NFC logo on the terminal (1 to 3 cm). Hold steady until the payment is confirmed. For detailed K2P instructions, refer here. Check out our K2P (Knock2Pay) “How-To” video here.