i would need to configure a banner campaign in an agency adserver and use a post impression tracking. the ad server may be doubleclick dfa or similar. then we will send the tags with several ad spots created to 12 publishers that will run the campaign and being paid on a CPC basis.
when the banners are clicked in the webs of these publishers, the users will be redirected to the landing page of the advertiser. if they buy something in that website, then the adserver should be able to grab data about the money paid in the transaction by the user that has bought in the web.