If you see a message asking you to contact Yonder while trying to add your card to Apple Wallet, it's most likely because you're trying to enter your card details manually.
At the moment, manual card entry isn’t supported for security reasons. Instead, you’ll need to add your card directly from the Yonder app. It’s quick, easy, and secure:
How to add your card:
Tap Membership
Tap Add to Apple Wallet
Once added, your card will be ready to use instantly.