Tracking Revenue by Referrer Type?

Hello,

Is there any way that the following can be done:

When the refer type is "advertising" is there any way that it can track the value of the transaction once a customer has completed checkout?

It doesn't matter what the landing page is, but the order completion page is always /index.php?route=checkout/success.

I can't work out how to set this up, but I imagine it can be done? :)

Many thanks,

Gary