How are YOU tracking the referrer/source of your sales?

Question for you guys doing media buys.

So you have a few different traffic sources coming to your offer...

You have Piwik and Statcounter installed.

Technically, you'd want to take the sessions that visited the "thank-you" page for the purchase and then categorize all those sessions based on where they came from, to find out where your buyers are coming from.

However, the referrer could get blanked with some sources, so I think it may be best to send the traffic to a landing page URL that has some sort of variable in it.

Any thoughts?

Use any kind of tracking systems (Voluum or Thrive) and pass the publisher tokens from traffic network back to your tracking system.