How to uniquely identify a given activity like a UUID

General questions
1

How to uniquely identify a given activity. For example a user visits a page and clicks on a link which in-turn makes a server request.

Is there an api in PIWIK we have something like a UUID with the combination of the following ?

  • UserID
  • VisitorID
  • Activity

(I assume from the documentation we need the above to uniquely identify an activity)

2

Use User ID for this: User ID - Analytics Platform - Matomo