This could be a really helpful thread, so bump ;]
Not 100% sure how to integrate with analytics, but off the top of my head, maybe you could create a separate domain for tracking, and setup a php sesssion script that after clicking on one of your links, adds the original referrer to the session + id of the site.
You could run this script on all of your sites, and if the session exists when a user clicks to another paysite, store that paysite's "ID" to the session too.
So if you had three paysites:
example1.com
example2.com
example3.com
+
trackingscript.com (you'd run the script from this domain on all paysites). I think this would let you maintain the session data across all domains, but I'm not the greatest developer so correct me if I'm wrong :P
you could add this data to NATs dynamically by appending the session data to your nats links like so:
nats.link.com/xjoaJWODJmncxncklaAWOPDJA/?autocamp=REFERRER_LINK&autotags=pid1,pid2,pid3
Wish I could help implementing this with GA though
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