Webservices change from 2.5 to 2.7?

by Colin Matheson.  

Hi  I am grasping at straws and trying to get the old TurnItIn.com Basic plugin to work on 2.7. Currently it fails at assignment creation with the error

P { margin-bottom: 0.08in; }A:link { }

• Unable to complete Moodle webservices call. 404 Not Found

The plugin worked in 2.5 so I am wondering what changed to create the 404 error. In the 2.7 moodle webservice folder is a file called upgrade which states

2.7
* All webservice server.php and simpleserver.php scripts must define('WS_SERVER', true)
  before including config.php file.

In the plugin I see a ws folder with a dispatcher.php which has a line
require_once("../../../../../config.php");

Should I try adding the line define('WS_SERVER', true) before the require_once?
Any other ideas or changes between web services in 2.7 compared to 2.5?