Determine true source when third party is using Google DFP
The company I work for purchased advertising through a third party who is using Google DFP and I'm trying to figure out how many people are coming to our site through their method or how many people are just searching us on Google. How do I tell the difference?
Currently, I have google / organic and google / cpc as the top two on my source list. Is there a way to tell which ones were directed to us by the third party?
Thank you in advance!