Building a First-Party Data Stack Before Third-Party Cookies Die
Chrome's third-party cookie deprecation keeps slipping but the writing is on the wall. Here is what to build now.
The End State
A clean customer ID that follows the user across login, post-purchase, email open, support ticket, and every other interaction. Stored in a customer data platform (CDP) or your CRM.
The Build Order
1. Get email or phone on every conversion. No exceptions.
2. Persist UTM parameters as first-party cookies for 90 days.
3. Implement server-side tracking via Stape, Customify, or self-hosted GTM Server.
4. Feed conversion data back to ad platforms via Conversion API (Meta), Enhanced Conversions (Google), Events API (TikTok).
5. Sync everything to a single source of truth (HubSpot, Salesforce, Customer.io).
What This Unlocks
Accurate attribution, durable lookalike audiences, lifetime value optimization, and protection against the next round of platform privacy changes.