How do I pay with Apple Pay online?
You can use your iPhone, iPad, and MacBook Pro with Touch ID to pay on websites in Safari. Macs without Touch ID will require you to complete the purchase with your iPhone or Apple Watch.
Select Apple Pay as the payment method at checkout.
Your default card will appear. To pay with a different card, tap the > icon on your iPhone or iPad, or the Expand icon on your MacBook Pro.
To confirm payment on iPhone and iPad, place your finger on Touch ID or enter your passcode. On MacBook Pro, follow the prompts on the Touch Bar and place your finger on Touch ID to confirm. If Touch ID is off, tap the Apple Pay icon on the Touch Bar and follow the prompts. Your device will display Done to indicate the transaction has been successful. Also see how to use Apple Pay in store and in Apps.