<?php

use WHMCS\View\Menu\Item as MenuItem;

add_hook('ClientAreaSecondarySidebar', 1, function(MenuItem $secondarySidebar)
{
    $secondarySidebar->getChild("Support")
        ->getChild("Open Ticket")
        ->setUri('https://www.unitedsupport.co.uk/billing/clientarea.php');
});