title: Tracking traffic going through 3rd party website on Google Analytics
body: <p>According to <a href="https://developers.google.com/analytics/resources/concepts/gaConceptsDomains" rel="nofollow">Domains &amp; Directories</a> from Google Analytic's documentation, having non-customized tracking code on <em>www.example.com</em> and <em>dogtoy.example.com</em> would provide inaccurate referrals and visitor counts. </p>
  
  <p>Enabling cross domain tracking would solve the problem, but what should I do when I cannot insert modified tracking code on <em>dogtoy.example.com</em>? (or when a user go through a third party payment processor, more realistically)</p>
  
  <p>How can I maintain data integrity on traffic referrals, visit count, visitor flow, etc when users go through processes like:</p>
  
  <p>www.example.com --> 3rd party payment processor --> www.example.com/thank_you</p>
  
  <p>I am using analytics.js (Universal Analytics). <br />
  Would it be a different concept or would it be any easier if I use ga.js?</p>