This function can be used to identify a visitor by email address or by profileid and source. If there is an existing profile with a matching email address or profileid, the existing contact will be updated. The behavioral data collected for the visitor will be added to the profile.

Email

<script>
_paq.push(["setCustomData", {"email": "EMAIL"}]);   _paq.push(['trackPageView']);
</script>

Profile ID

<script>
_paq.push(["setCustomData", {"profileid": "PROFILEID", "profilesource": "SOURCE"}]);  
_paq.push(['trackPageView']);
</script>
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