The affiliate glossary ↗AFFDude / Field notes
Postback
In plain English
What does Postback mean?
A server-to-server call the advertiser or network sends to your tracker when a conversion happens, keyed by the click ID.
Postbacks (S2S tracking) replace browser pixels: when the conversion fires, the network calls your tracker's postback URL with the click ID you passed in the link. No cookies, no browser, no ad blockers. Every serious tracker and network supports it; setting the click ID parameter correctly is the first thing to test on any offer.