We have some devices with Unique browser string created and installed on them. We want to be able to track this devices in Google Analytic using Google Tag Manager. I know this is possible using the Google Tag Macro but i am not sure what Variable to pass when creating the macro. The old way we do this is:
ga('set', '&uid', {{ USER_ID }});
ga('send', 'pageview');
I am just not sure how to pass the user ID string in Tag manager.
