Yes, you can add and remove a card within the Tulip Mobile app at anytime and set a new card as default after your first billing cycle.
To update within the app:
1. Launch the Tulip Mobile app and select Billing (bottom navigation)
2. Click on Add/Remove card (near the top).
3. Choose if you want to update the card expiration date or add a new card
Please contact Customer Support if there are any issues updating your payment method.