Semih Yesilyurt
145689a391
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The browser pixel under-counts signups badly: ~96% of paid traffic is mobile in-app browsers where iOS ITP / ad-blockers drop client events, and the OAuth path never fired it reliably. Meta recorded ~0 registrations for a 7.5K-spend campaign while PostHog saw 98 facebook signups — so Meta could neither optimize toward nor attribute signups, which is the main driver of the low signup rate. This adds a server-side CAPI CompleteRegistration: - MetaCapiService + @Global module. Fail-open: no-ops unless META_CAPI_PIXEL_ID + META_CAPI_ACCESS_TOKEN are set; never throws (signup must not break). SHA-256 hashed email + fbp/fbc/IP/UA. - Fired from the better-auth user.create.after hook for ALL signups (reliable, covers Google OAuth which the browser pixel missed entirely). - A session-gated POST /analytics/meta/complete-registration endpoint adds fbp/fbc/IP/UA (ad-click attribution) for the email path. - The browser pixel now passes a shared event_id (signup_<userId>); the premature Google client-pixel fire (fired on click, before completion) is removed. - All sources dedupe via event_id=signup_<userId>. Activate by setting META_CAPI_PIXEL_ID + META_CAPI_ACCESS_TOKEN (Events Manager) in the api env; META_CAPI_TEST_EVENT_CODE routes to Test Events for verification. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>