Hi Kevin.
	 
	Do we really need to set up the notification URL in the PayPal preferences ? This URL has been already set for another application, so we cannot change it.
	Why you do not use the "ipn_notification_url" parameter to indicate PayPal the  URL (alongside the "return_url" and "cancel_url" parameters) when you send the order to PayPal ?
	 
	 
	Thanks
	Rico