To update your card, you must first delete your card, and then you can re-add it with the updated information.
- Select your name from the top left of the side menu in the app.
- Select Payment Methods.
- There you will see your credit cards. Swipe a card to the left to expose the Delete button and hit "Delete".
- Tap Add Card
- Tap your name or phone number at the top of the side menu of the app.
- Then select Payment Methods.
- Press and hold the card you would like to delete, and select "Delete".
- Then you can re-add your card with the updated information.