An affiliate tracking method where conversion data is passed directly from the brand's server to the affiliate network's server — bypassing the browser entirely — rather than relying on browser-side cookies or JavaScript pixels. How it works: when a customer completes a purchase, the brand's backend server sends a server-to-server (S2S) postback to the affiliate network with the conversion details (transaction ID, order value, publisher ID); the network records the conversion without a browser pixel needing to fire. Advantages over browser-side tracking: immune to iOS Intelligent Tracking Prevention (ITP) and browser cookie restrictions; not blocked by ad blockers; works for in-app purchases where browser cookies are unavailable; more reliable than browser-side tracking which can fail due to page load errors, browser settings, or ad blocker interference; eliminates cookie consent impact on affiliate attribution. Disadvantages: requires technical implementation on the brand's server backend; more complex to set up than a browser pixel; requires maintaining secure S2S postback connection with the affiliate network. Who should implement: any brand with significant mobile traffic or iOS-heavy audience; brands where attribution accuracy is a priority; larger programs where tracking reliability directly translates to meaningful commission accuracy; increasingly the industry standard for enterprise affiliate programs.
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