As iOS develops new features, the user experience becomes more seamless. For example, with an iPhone 6 / iPhone 6 Plus or later, you can use Touch ID to make Apple Pay purchases within apps, in stores, and on websites in Safari. 

To make website purchases from your Mac, you can also use Touch ID on your iPhone. Here is how you do it:

  1. Open the relevant store.
  2. Select an item that you want to purchase & click 'Buy'.
  3. A Touch ID prompt will appear. Place your finger on Touch ID to complete the purchase.

On iPad Pro, iPad Air 2 or iPad Mini 3 or later, Touch ID can be used for Apple Pay purchases within apps and on websites in Safari.