This project showcases how I implemented Cross-Domain Tracking in Google Analytics 4 (GA4) to unify user sessions and conversions across multiple domains.

The client was losing conversion attribution because users were redirected between their main website and an external checkout domain (for example, example.com → checkout.example-pay.com).

Using Google Tag Manager (GTM) and GA4’s advanced measurement features, I ensured accurate tracking across both domains without session breaks — providing clean, unified analytics data for better marketing attribution.

🎯 Objectives

Enable Cross-Domain Tracking between the main and external checkout domains

Maintain single user sessions across multiple domains