For Apple Pay or Google pay checkout methods to be available, you must be using a compatible browser, device, and have a card saved. 

Important: Without these, the web payment buttons will not appear in checkout.

The exact requirements for web payments to appear are:

Chrome (Google Pay only)

Chrome 61 or newer.

A saved payment card

Chrome Mobile for Android (Google Pay only)

Chrome 61 or newer.

An activated Google Pay card or a saved card (Settings > Payment methods).

Access payment methods enabled (Settings > Privacy).

Microsoft Edge for Windows

Microsoft Edge 16.16299 or newer.

A saved payment card.

Mobile Safari (Apple Pay only)

Mobile Safari on iOS 10.1 or later.

A card saved in Wallet, by going to Settings > Wallet & Apple Pay.

Safari (Apple Pay only)

Safari on Mac running macOS Sierra or later.

An iPhone (not an iPad) with a card in its Wallet paired to your Mac with Handoff, or a Mac with TouchID.