Removed redundant functions, some Standardisation work

modules/checkout/classes/Model/Checkout/Notify.php

@@ -9,7 +9,7 @@
  * @copyright  (c) 2009-2013 Open Source Billing
  * @license    http://dev.osbill.net/license.html
  */
-class Model_Checkout_Notify extends ORM_OSB implements Invoicable {
+class Model_Checkout_Notify extends ORM {
 	// Relationships
 	protected $_has_one = array(
 		'checkout'=>array('far_key'=>'checkout_id','foreign_key'=>'id'),
@@ -25,10 +25,6 @@ class Model_Checkout_Notify extends ORM_OSB implements Invoicable {
 		'data',
 	);
 
-	public function invoice_item($item_type) {
-		return sprintf('Payment Fee: %s',$this->checkout->name);
-	}
-
 	public function process() {
 		return $this->checkout->plugin()->notify($this);
 	}