/**
 * @inheritdoc
 */
public function behaviors()
{
    /* 1 day in seconds, until browser closed by default */
    $expire = 60 * 60 * 24;
    return [
        [
            'class' => 'linkprofit\ReferralFilter\ReferralFilter',
            'sessionMarkers' => [
                'data1', 'data2', 'data3', 'data4', 'data5', 'chan'
            ],
            'cookiesMarkers' => [
                'refid', 'cfads', 'CampaignID'
            ],
            'cookiesExpire' => $expire
        ],
    ];

Session markers are written to $_SESSION['markers']['markerName'], cookies markers are written directly to $_COOKIE['markerName'];