To check your Payment Methods navigate to
Config → Finance → Payment Methods.
Payment methods listed here are set by default. When you install a new payment module(ex. SageOne, Netcash, Stripe etc.) it will automatically appear here.
You can add a new Payment method manually by clicking the Add icon at the top-right corner of the page. The window will appear where you will type the name of the Payment Method and enable the option "Active".
After adding a new Payment method it will appear in each customer's Billing settings in
Customers → View →Billing →Billing overview.
It is possible to Edit (Rename) or Delete Payment methods by clicking on the icons in the Actions column of the table.