To check your Payment Methods click on
Config → Finance → Payment Methods.
Payment methods listed here are set by default. When you install a new Payment Modul it will automatically appear here.
You can add a new Payment method manually by clicking Add icon at the top-right corner of the screen. The window will pop-up where you will write the name of the Payment Method and enable the option "Active".
After adding a new Payment method it will appear in each customer Billing settings in
Customers → View →Billing →Billing overview.
It is possible to Edit (Rename) or Delete Payment methods by clicking on icons and in Actions section of the table.