Add a credit or debit card to your iPhone so you can pay with a tap.
It comes pre-installed — look for the black icon with colored cards on your home screen, or swipe down and search for "Wallet."
You may need to tap "Continue" and sign in with Face ID, Touch ID, or your passcode.
Your bank may require a verification code sent via text or email before the card is approved.
Look for the contactless payment symbol (four curved lines) at the register. Double-click the side button to bring up your card if it doesn't appear automatically.