function referral_shortcode()
{
    $view = new View();
    $controller = new ReferralsController($view);
    if (isset($_POST['referral_submitted']) && (int) $_POST['referral_submitted'] === 1) {
        $controller->create();
        // do the saving logic
        // render the completed form
    } else {
        return $view->render_form();
    }
}