Use transit cards with Apple Watch
On your Apple Watch, you can use a transit card with Apple Pay where accepted to pay your fare. See the Apple Support article Ride transit with Apple Pay.
Note: Apple Pay may not be available in all areas, and Apple Pay features may vary by area.
If a preferred card is not required by a transit system, you can use a payment card in Wallet to pay for transit without double-clicking the side button. To choose a card for Express Transit and use it to pay for transit, follow these steps:
Open the Apple Watch app on your iPhone.
Tap My Watch, tap Wallet & Apple Pay, then tap Express Transit Card.
Under Payment Cards, tap the card you want to use, then enter the Apple Watch passcode on your watch.
As you approach a fare gate or board the bus, make sure your Apple Watch is turned on (it doesn’t need to be connected to a network).
Hold your Apple Watch display within a few centimeters of the middle of the contactless reader until you feel a vibration. You see Done and a checkmark on the display.