To set up cross-domain tracking for your website, which spans multiple domains, you need to ensure that user sessions are tracked consistently across these domains. Here's a step-by-step guide:

1. Google Analytics Account Setup:

   • Ensure you have a Google Analytics account properly set up and linked to all your domains.

2. Modify Tracking Code:

   • Update your Google Analytics tracking code to include the autoLink plugin. This will help in automatically transferring the Client ID between the domains.

   • Use the following syntax for the gtag.js tracking code:

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     1gtag('config', 'UA-XXXXXX-Y', { 2 'linker': { 3 'domains': ['example.com', 'another-example.com'] 4 } 5});

   • For analytics.js, use:

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     1ga('create', 'UA-XXXXXX-Y', 'auto', {'allowLinker': true}); 2ga('require', 'linker'); 3ga('linker:autoLink', ['example.com', 'another-example.com']);

3. Ensure Consistent Tagging:

   • Make sure both domains use the same GA property ID.

4. Cross-Domain Link Tracking:

   • Ensure all links between the domains include the necessary parameters to pass the Client ID. This is handled by the autoLink plugin.

5. Test and Verify:

   • Use Google Tag Assistant or GA Debugger to verify that the Client ID is being passed correctly between domains.

   • Check the Real-Time reports in Google Analytics to ensure data is flowing correctly when moving from one domain to another.

6. Custom Dimensions (Optional):

   • If you need more detailed tracking, consider setting up custom dimensions to track specific user interactions across domains.

7. Monitor and Adjust:

   • Regularly monitor your Google Analytics reports to ensure data accuracy and make adjustments as needed.

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By setting up cross-domain tracking, you'll have a more comprehensive view of user interactions across your websites, allowing for better insights and decision-making in your media buying and budget management strategies. This setup is crucial for accurately attributing conversions and understanding the complete customer journey