To modify an existing payment option select View/Modify Payment Options from the Payments menu. You will be shown a list of the payment options that are currently active. Click on the Modify button to edit an option. Click on the Disable icon to disable a payment option that is currently active. If you disable a real-time payment gateway, you can enable it again at any time.
When you eliminate an offline payment options, you are deleting it from the store, not just disabling it. To enable it again, you will have to re-create it. A way to disable it is to make it hidden from retail customers by setting it as “wholesale only”.