If you are not using the FuelMor integration with a payment processor this navigation item of Payment Methods will not appear in the customer account navigation list.
Payment Methods are used to store customer credit/debit cards.
Manage Payment Methods at customer account, Payment Methods.
You may add or delete a credit/debit card Payment Method. You may also edit certain properties of the card.
When entering a card number in the Card Number field the box around the field will be colored red until a valid card number is entered.
Primary slide switch allows you to designate a Payment Method that is the Primary. For example, a customer may have several Payment Methods but they have requested that a specific Payment Method be their primary.