How to track Cross-Domain Tracking via GA4 ?

Tracking cross-domain traffic in Google Analytics 4 (GA4) involves setting up and configuring parameters to ensure data flows accurately between different domains or subdomains. Here’s a step-by-step guide on how to achieve this:

1. Set up GA4 Property in GA4 

• Ensure you have a GA4 property created for your website if you haven’t already.

2. Modify Tracking Code

• GA4 uses the Measurement ID instead of the traditional UA code. Ensure the GA4 measurement code (gtag.js) is installed on all domains/subdomains you want to track.

3. Configure Cross-Domain Tracking

• In your GA4 configuration snippet, specify the domains you want to track under the linker parameter.
• Include all domains and subdomains that you want to treat as part of the same user session.

4. Verify Implementation

• Once implemented, verify that the cross-domain tracking is working correctly using the Realtime reports in GA4. Visit pages across different domains/subdomains to ensure sessions are tracked as expected.

5. Testing and Debugging

• Use the GA4 Debug View (available in the GA4 interface under Debug View) to check that events are being sent correctly from all domains/subdomains.