Why do I need to add a credit card after paying $20.00?
Even though you've already made a pre-payment to become a seller, certain items and categories require a credit card to be placed on file for security reasons. Placing a credit card on file gives you a full seller account to sell in all categories.
When you place a credit card on file, it will be authorized for $1.00 to validate the credit card. This is not a fee, as the authorization will expire and your credit card will not be charged.