private function getCampaignParametersForPromoUrl($campaignName, $campaignMedium, $campaignContent = '')
    {
        $campaignName = sprintf('pk_campaign=%s&pk_medium=%s&pk_source=Piwik_App', $campaignName, $campaignMedium);

        if (!empty($campaignContent)) {
            $campaignName .= '&pk_content=' . $campaignContent;
        }

        return $campaignName;
    }