An affiliate conversion tracking method in which the brand's server directly sends conversion data (order ID, commission amount, conversion type) to the affiliate network's server over an HTTPS API call when a conversion occurs — bypassing browser-side tracking entirely and providing the most reliable conversion attribution in an environment of increasing browser privacy restrictions, ad blocker usage, and mobile tracking limitations. Server-to-server postback is increasingly considered the gold standard for affiliate tracking reliability as browser-side methods (tracking pixels, cookies) face growing restrictions. How S2S postback works: when a consumer clicks an affiliate link, the affiliate network's tracking system records the click and sets a tracking cookie or generates a click ID; on the brand's conversion confirmation page (order confirmation, subscription success), the brand's server reads the click ID stored in the cookie (or passed as a URL parameter through the purchase funnel); the brand's server then sends a POST request to the affiliate network's postback endpoint with the click ID and conversion data; the affiliate network matches the click ID to the originating publisher and credits the commission. Advantages over pixel-based tracking: not blocked by ad blockers (server-to-server communication is not subject to browser extension blocking); not affected by ITP (Apple's Intelligent Tracking Prevention limits JavaScript-set cookie lifetimes; S2S postback does not use browser-side cookies for the conversion reporting step); more reliable (pixel firing failures due to page load timing, JavaScript errors, or browser settings cause pixel-based attribution loss; server-side tracking is controlled by the brand's own server rather than the user's browser). Implementation requirements: technical development by the brand's engineering team to implement the postback call on conversion events; most affiliate networks provide technical documentation for S2S postback implementation; setup complexity is higher than pixel-based tracking but provides significantly more reliable attribution.
Related Resources