PPV referrer



Normally blank, if you're using Prosper202, enabling 'target passthrough' or {{vurl}} will pass the referring domain along as a keyword.
 
I cannot speak for anything but TrafficVance, but with TrafficVance there is no referrer. You can do something similar to the vgeek mentioned above with TV but you need to use {KeyWord} as the argument. I believe {{vurl}} is for directcpv.
 
From all the CPV networks I've used only AdOn passes referrers sometimes. The others pass no referrers (unless you want , by using the network tokens).

If you are trying to hide the fact the you are using cpv traffic, keep in mind there are other ways to detect it (like the user agent string for some cpv networks).