Affiliate Program Ops | Affiliate Tracking | Analytics Affiliate Link Tracking Best Practices: UTMs, SubIDs & S2S Proof ByMara February 9, 2026September 22, 2026 A practical 2026 tracking system you can audit: pick a source of truth, standardize UTMs vs SubIDs, plan for cookie loss, and use server-side/hybrid postbacks to reconcile GA4 with network payouts.