Mastering server-side tracking setup to improve Facebook conversion accuracy directly addresses the fragmentation problem that has plagued pixel-based measurement since iOS 14.5 rolled out. Modern browsers block third-party cookies, ad blockers strip pixel firing, and users navigate across devices—all of which creates blind spots in your conversion funnel that undermine budget allocation decisions. The CAPI v2 approach bypasses these obstacles by sending conversion data from your backend infrastructure to Meta's servers, ensuring that legitimate transactions are captured and attributed correctly regardless of browser settings or user privacy tools. This setup demands configuring API calls, mapping user identifiers (email, phone, hashed data), matching server events to Facebook's expected schema, and testing the full pipeline before going live at scale.