Just a heads-up if anyone finds themselves in the SF Bay Area and tries to add a Clipper transit card to Apple wallet:
Revolut Visa cards in Apple Pay don’t work to add balance to these cards - they just show as declined in both Apple Wallet and the Revolut app - however Revolut Mastercards in Apple Pay are fine.
Should one find themselves in this situation, a workaround might be to create a virtual Mastercard in the Revolut app and add to Apple Pay, if your Revolut app offers the option to create Mastercard virtual cards.