Apple Pay allows you to use your iPhone’s stored credit or debit cards to make payments easily using your phone.
Apple Pay is available for iPhone 6 and later models, Apple Watch-compatible devices (iPhone 5 and later models), iPad Air 2, iPad Pro and iPad Mini 3 or later. You'll need to use a major credit or debit card as well.
To see if your bank or credit card participates in Apple Pay, please consult this list.