This sample JavaScript is where a matched Identity event occurs when a user logs in to a website.

<script type="text/javascript">
    function getuserId()
    {
        // Fill in this function to retrieve and return the client user id 
        from the page
        return null;
    }

    try
    {
        var USER_ID = getuserId();
        if (USER_ID)
        {
            var DSP_PIXEL_URL = "{Replace with DSP ID Sync Pixel URL}";
            var DSP_NAME = "{Replace with DSP Name}";
            var DSP_UUID ="{Replace with DSP UUID Name}";
            var USER_ID_Name = "{Replace with Partner User ID Name}";
            var UBX_HOST   = "{Replace with UBX Host Name}";
            var AUTHKEY    = "{Replace with UBX DSP Endpoint Auth Key}";

            //UBX URL Format is 
https://{UBX_HOST}/v1/customevent/matchedIdentity/{AUTHKEY}/DSPID_{DSP_NAME}
={DSP_UUID}/{USER_ID_Name}={USER_ID}
            var UBX_CALLBACK_URL = encodeURIComponent("https://"+UBX_HOST+"
            /v1/customevent/matchedIdentity/"+AUTHKEY+"/DSPID_"+DSP_NAME+"=") +
                                   DSP_UUID + encodeURIComponent
                                   ("/"+USER_ID_Name+"="+USER_ID);
            var DSP_FINAL_CALLBACK_URL = DSP_PIXEL_URL + UBX_CALLBACK_URL;
            new Image().src = DSP_FINAL_CALLBACK_URL;
        }
    }
    catch (err) {
        console.log('Error:'+err.message);
    }
</script>