Paying with your iPhone is just like paying with your credit card. Instead of your Card, you hold your iPhone near the payment terminal’s contactless reader. Confirm your payment with Face ID, Touch ID, or your access code. This depends on the iPhone model and the settings you chose.
Using Face ID
Double-click the side button on your iPhone and look at your screen. Hold your iPhone near the reader.
Using Touch ID
Double-click the side button on your iPhone. Place your finger on the home button while you hold your iPhone near the reader.
Using your access code
Double-click the side button on your iPhone. Unlock your iPhone with your access code and hold your iPhone near the reader.