Apple Pay and Google Pay OS compatibility

iPhone iOS iPad iPadOS Android
Apple Wallet iOS 8.11 and greater N/A2 N/A
Google Pay N/A N/A Android 5.03 and greater
Wallet Passes4 N/A N/A Android 5.0 and greater

1 Apple Wallet when launched was called Passbook, so older Apple devices can be running Passbook instead of Apple Wallet and supporting most of the features.

2 Apple Wallet is not available for iPad.

3 Android Pay is only supported in certain countries https://en.wikipedia.org/wiki/Google_Pay#Supported_countries

4 Wallet Passes allows Android users to use Apple Wallet passes in Android devices.