Payment Method
To define and activate payment methods your company supports, click your username at the top right and navigate to Settings > Payment Method. The payment methods you select will appear in a picklist when you set up the billing and payment terms for a customer within the customer account.
Note that you can create payment methods using the API operations even if the payment method type is not selected on the Customize Payment Methods page.
See Define Payment Methods for more information about the supported payment methods.