Q: How to get the original referrer url on success page? I have a code that its executed only on the head tag of the success page. This code is to track if the buyer is coming from Comission Junction.
I need to set a variable to true if the original referrer comes from commission junction affiliate links which looks like this:
http://www.jdoqocy.com/click-1245-2342423?SID=TrackingTest
is there an easy way to do this?
I was thinking about referral url but I guess that variable changes each time you go from page to page: add to cart -> billing address -> shipping address -> payment -> overview -> success
My code is
    public function getCommissionJunctionUdo($orderId) {
            $order = Mage::getModel('sales/order')->loadByIncrementId($orderId);
            $udo = array();
            $udo['CID'] = 'XXXX';
            $udo['TYPE'] = 'XXXX';
            $udo['CURRENCY'] = 'USD';
            $udo['OID'] = $orderId;
            $udo['DISCOUNT'] = number_format(abs($order->discount_amount),2);

            $order_coupon_code = $order->coupon_code;
            if(!is_null($order_coupon_code) && !empty($order_coupon_code)) {
                $udo['COUPON'] = $order_coupon_code;
            }

            $udo['PRODUCTLIST'] = self::_getOrderProductsList($order);       

            if(referral url come from CJ) 
{
                $udo['FIRECJ'] = "TRUE";
            }
            else {
                $udo['FIRECJ'] = "FALSE";
            }

            $masterTmsUdo['CJ'] = $udo;
            $json_masterTmsUdo = json_encode($masterTmsUdo);

            return $json_masterTmsUdo;

        }

Thanks

A: You can observe the event controller_action_predispatch.
it is dispatched for every page in magento.
Then you can check if the $_SERVER['HTTP_REFERER'] (or Mage::app()->getRequest()->getServer('HTTP_REFERER') if you want to be "politically correct") matches your needs.
If so, then set a value to the session.  
Mage::getSingleton('core/session')->setComissionJunctionReferer(true);

Then, in your checkout page you can just check if the value is set.  
if (Mage::getSingleton('core/session')->getComissionJunctionReferer()) {
    //your magic here
}


A: $_SERVER['HTTP_REFERER'] will give you the referrer page's URL if there exists any. try it

A: L.V try below
Mage::app()->getRequest()->getServer('HTTP_REFERER');

