Aside from the available support payment methods, the Site Admin can add more payment methods to the Classified plugin. To understand the process, follow the instructions.
Access Admin Dashboard => Plugins Manager => Classifieds => Payment Methods tab.
ClickAdd New Payment Method button => show pop-up.
Enter the payment method’s name => Click the Save button.
(Front-end)
When members create a new listing, the new payment method will be visible.