Apple Pay online payment flow: on the checkout form, click the Apple Pay button. OS pops up a form confirming the payment card, amount, delivery address etc. Pu

Apple Pay online payment flow: on the checkout form, click the Apple Pay button. OS pops up a form confirming the payment card, amount, delivery address etc. Put finger on Touch ID sensor to confirm. n.b. the payment card details and address come from your Apple Pay wallet; you don't enter them onto the checkout form. Apply Pay Express Transit payment flow for e.g. the subway: touch phone to sensor and go.