All iPhone models with Face ID and iPhone models with Touch ID, except for iPhone 5s.
All Apple Watch devices.
All iPad Pro, iPad Air, iPad, and iPad mini models with Touch ID or Face ID can use Apple Pay in apps and websites in Safari.
Mac devices with Touch ID, or Mac models from 2012 or later with an Apple Pay enabled iPhone or Apple Watch in Safari.
You can find the full list of Apple Pay compatible devices on Apple’s support page here.