iPhone X or later models:

❶⠀double-click on the side button of your phone;

❷⠀when "Default card" is displayed on the screen, select it by tapping;

❸⠀then select the BT card you wish to pay with;

❹⠀ authenticate yourself with Face ID;

❺⠀and bring your phone close to the contactless terminal 😉

iPhone 8 or older models:

❶⠀approach your phone to the contactless terminal without tapping Touch ID;

❷⠀when "Default card" is displayed on the screen, select it by tapping;

❸⠀then select the BT card you wish to pay with;

❹⠀authenticate via Touch ID to make payment and you're done! 😃

AppleWatch:

❶⠀double click on the side button;

❷⠀when "Default card" is displayed on the screen, swipe (right or left) to select another card enrolled in Apple Pay;

❸⠀and bring the watch close to the contactless terminal to make the payment. 😎