WHMCS Invoice4U register your license once you activate it. The license will register your server’s ip and working directory. If you move your WHMCS to another server, you will need to reissue the license through our client’s area.
Login to our clients area, from the top menu navigate to “Services” -> “My Services“, and choose WHMCS Invoice4U (click the “View Details” button).
Under “Management Actions“, click on “Reissue License“.
Now all you need to do is to access the WHMCS Invoice4U through the GUI, and the license will be reissued using the new server details.