To add a new credit card to your account on Dockwa.com:
Log into your Dockwa account
Select "Payment" under the Account menu in the upper right-hand corner
Once on the "Credit Cards" tab, add a credit card by pressing the "Add New Card" button
To add a new credit card to your account on the Dockwa Mobile App:
Log In to your account
Select "Payment" under the Profile tab
Once on the "Payment Info" screen, add a credit card by clicking the "Add New Card" button
You may also elect to use Apple Pay if you are using an iPhone