With Express Mode, there’s no need to use Face ID or Touch ID to ride transit. When you add your first Clipper card to your iPhone or Apple Watch, it will be enabled for Express Mode automatically. Any additional Clipper cards will not be enabled for Express Mode automatically, but you can easily enable Express Mode in the Settings app.
Retail add value machines and handheld Clipper card readers do not support Express Mode. Without Express Mode, you must authenticate with Face ID, Touch ID, or your passcode, or double-click on your Apple Watch for the Clipper reader to read your Clipper card.