We use Tealium as our TMS and the consultant who implemented Tealium put in a s_doPlugins extension.  Here's a copy of the extension: visitorapi/s_doplugin.txt at master · andyma1991/visitorapi · GitHub

Here's the link to the visitorapi.js: https://github.com/andyma1991/visitorapi/blob/master/visitorapi-orgid3.txt

Is there a way to attach files in the forum?

We're not using DTM at all.  Unfortunately, the link is in our QA environment and there's not a good way to access it.  I can send the visitorapi.js if that would be helpful.  Here's the link to the implementation guide: Implement the Marketing Cloud ID Service for Analytics

Hi,I'm trying to to implement visitorapi.js outside of DTM and I'm getting the following error:VisitorAPI.js:6 Uncaught ReferenceError: Visitor is not defined    at Object.<anonymous> (VisitorAPI.js:6)    at Object.n.3../ChildVisitor (VisitorAPI.js:7)    at r (VisitorAPI.js:1)    at e (VisitorAPI.js...