Hi all,
On my site, When a user makes a conversion (conversion = fills in a form), he received a unique ID from the system (unique meaning no two clients can have the same ID).

Is it possible to track for every unique ID on GA, e.g. where this specific user came from (the entire referring url – including tracking parameters).

How do I set it up on custom variables, so I can track it on GA?

Thanks in advance for the help,