<?php defined('SYSPATH') or die('No direct access allowed.'); /** * This interface ensures that all invoice processing objects have the right methods * * @package Invoice * @category Interface * @author Deon George * @copyright (c) 2009-2013 Open Source Billing * @license http://dev.osbill.net/license.html */ interface Invoicable { // Render the line item for an invoice public function invoice_line(); } ?>