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For vanity urls, we have the redirect landing our our site with a url parameter of "refd" that has the referring domain in it.
For instance, if our real site is "http://mysite.com" and we have a vanity domain of "http://myfancydomain.com" that redirects to http://mysite.com?redf=myfancydomain.com we need to set the s.referrer to "myfancydomain.com".
In case you want to capture "myfancydomain.com" from the URL http://mysite.com?redf=myfancydomain.com, you can use Util.getQueryParam() method to capture refd query string value in s.referrer variable.
Something like this: