title: How to create Liferay hook in order to extend functionality of shopping cart portlet
body: <p>Can anyone help me out on how to create a hook within Liferay for the shopping cart portlet? I would like to implement custom code at the point of a successful order. Any help is appreciated.</p>
  
  <p>I've tried reading the documentation for overriding services:
  <a href="http://www.liferay.com/community/wiki/-/wiki/Main/Portal+Hook+Plugins" rel="nofollow">http://www.liferay.com/community/wiki/-/wiki/Main/Portal+Hook+Plugins</a></p>
  
  <p>but I'm not sure what the service would be that I need to override.</p>
  
  <p>Thanks!</p>