Select the associated checking or credit card account.
Tap Card Services, then select the Add to Apple Wallet or Add to Google Pay button. (Depending on which preferences you have enabled, you may need to go through your multi-factor authentication steps.)
Confirm that your information is correct, then follow the steps to add your card to your wallet. Agree to the Terms & Conditions.
A confirmation screen will appear letting you know your card is added to your wallet and ready to use.