pap click tracking api

/ init session for PAP
    $session = new Gpf_Api_Session("URL_TO_PAP/scripts/server.php");
 
    // register click
    $clickTracker = new Pap_Api_ClickTracker($session);
    try {  
        $clickTracker->track();
        $clickTracker->saveCookies();
    } catch (Exception $e) {
    }
 
if ($clickTracker->getAffiliate() != null) {
        echo $clickTracker->getAffiliate()->getValue('userid'); // prints affiliate userid
        echo $clickTracker->getAffiliate()->getValue('refid'); // prints affiliate refid
    }
 
    if ($clickTracker->getCampaign() != null) {
        echo $clickTracker->getCampaign()->getValue('campaignid'); // prints campaign id
    }