I understand advertiser put pixel code in thank you page. However, when thank you page loads up and fires the pixel code, how does CPA network knows which publisher referred or knows that non of his publisher referred to the website? For example what if a visitor found the website on his own and not thru affiliate then loads thank you page. (Scratching my head). Does CPA network give affiliate special landing URL so when the landing URL is used, CPA network waits for the pixel to be fired? No tracking needed on advertiser's server?
Hope I made sense lol!