Server-to-server tracking, often called S2S, is a method where conversion data passes directly between the advertiser's server and the network's server, rather than relying on a cookie stored in the customer's browser. It is more resilient to ad blockers, cookie restrictions, and cross-device journeys than traditional cookie-based tracking.
A customer clicks a publisher's link on their phone but completes the purchase later on a laptop. With server-to-server tracking, the advertiser's backend still passes the original click ID to the network, correctly crediting the sale despite the device switch.
Browser cookie restrictions, third-party cookie deprecation, and rising ad-blocker use have made cookie-based tracking increasingly unreliable. Server-to-server tracking doesn't depend on the customer's browser storing anything, making attribution more accurate and durable as privacy rules and browser defaults keep tightening.
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