This tutorial is mainly introducing the differences between Apple Pay and Apple Pay Cash.

What’s Apple Pay?

Apple Pay is a mobile payment and digital wallet service by Apple Inc. that lets users make payments using an iPhone, Apple Watch, iPad or Mac. Apple Pay does not require Apple Pay-specific contactless payment terminals, and can work with existing contactless terminals.

What’s Apple Pay Cash?

Apple Pay Cash is technically part of Apple Pay, Apple's mobile payment system, but it lives in Apple's iMessage app. And all the money you receive via Apple Pay Cash will live on a virtual card called Apple Pay Cash card, which exists within Wallet, Apple's other app for storing credit cards, debit cards, loyalty cards, boarding passes, tickets, and more.

Which devices support Apple Pay?

All devices with Touch ID (except the iPhone 5s) support Apple Pay, but not every iOS device can make in-store purchases. Only devices with an NFC chip can use the Apple Pay terminals at retail locations.

Supported Apple Pay Devices: iPhone 6, iPhone 6 Plus, iPad mini 3, iPad Air 2, Apple Watch.

Which devices support Apple Pay Cash?

Apple Pay Cash will be available through an update to iOS 11 on iPhone, iPad, and Apple Watch. But it only works on TouchID-supported devices, including Apple Watch, which means older iOS devices won't be able to take advantage of the peer-to-peer payments service.

Supported Apple Pay Cash iDevices: iPhone SE, iPhone 6 and later, iPad Pro, iPad 5th generation, iPad Air 2, iPad Mini 3 and later, Apple Watch.

Where can I use Apple Pay?

Apple Pay is currently available in the U.S., U.K, Canada, Australia, and China. Most banks in the U.S. and U.K. now support it, while American Express is first out the gate in Canada and Australia.

International Apple Pay participating banks and store cards 

Where can I use Apple Pay Cash?

Apple Pay Cash will only be available in the US at launch. There's no word yet on UK availability.

Want to know how to use Apple Pay Cash on your iPhone, just follow the steps of this tutorial: How to Use Apple Pay Cash on iPhone?