src/Model/Order.php
public function Link()
    {
        if (Security::getCurrentUser()) {
            $link = Controller::join_links(AccountPage::find_link(), 'order', $this->ID);
        }

        $link = CheckoutPage::find_link(false, 'order', $this->ID);

        $this->extend('updateLink', $link);

        return $link;
    }
public function Link()
    {
        if (Security::getCurrentUser()) {
            $link = Controller::join_links(AccountPage::find_link(), 'order', $this->ID);
        }

        $link = CheckoutPage::find_link(false, 'order', $this->ID);

        $this->extend('updateLink', $link);

        return $link;
    }
Get the link for finishing order processing.