Kids who are 13 and older can use Apple Pay for in-store purchases by adding their Smart Card to their Apple Wallet, right from the app. Mydoh is currently only available on iOS devices, so the Smart Card only works with Apple Pay.
Your kids do not require Apple Pay for online purchases. Just tap the card in the app and enter your child’s password to view the Smart Card information.
Note: Apple restricts the use of Apple Pay for children under 13 years old.