You'll need to be signed in to the same iCloud account on your iPhone, iPad, Mac, or Apple Watch. Your Mac needs to have Bluetooth on. Then:

  • 1. Tap the "Buy with Apple Pay" or "Apple Pay" button
  • 2. Verify the information and card that's being used

To make the purchase, place your finger on Touch ID on your iPhone or double-click the side button on your Apple Watch, and you're done.