Hide a payment method from the front-end

I need to enable a payment method for use in the back-end only while in the front-end it should be hidden.

In other terms, it should be available when an order is created in the back-end but not to regular customers.

I have not found any extension allowing this, do you have any idea or suggestion?

Thanks!

Check this extension, they are offering Restrict payment option. If this doesn't suit you then contact the support team of this extension.
http://www.opencart.com/index.php?route ... n_id=21201

Thanks a lot, I had not found it when I searched.