To add a payment method from your client account, log in to your account and select the Invoices tab. From there, select the Payment Methods button in the upper right-hand corner of the page:
On the following screen, there will be a form for adding either a credit card or a bank account. Once payment method details have been entered, click Add Payment Method to save it.
To remove a payment method from your client account, log in to your account and select the Invoices tab. Then, select the Payment Methods button. This will take you to a screen that initially shows you the option to add a new card. To find the existing payment methods you on file, scroll down the page until you see the Delete Existing Cards section in order to see the option to delete any payment methods you have previously added to your account:
