Cross-Domain Tracking with GTM
If you have the multiple domains and you’d like to analyze the users in a single analytics view. Setting up the cross-domain tracking with GTM can be very useful.
Cross-domain tracking is a way to analyze visitors across multiple websites in a single analytics view.
As it will measure those visits as one. Without this tracking, Google Analytics will consider this user as two separate visitors.
As a result, will increase the number of users appear in your reports.
This occurs even if both domains use the same Tag Manager container and Analytics account.
A prime example we commonly see is within the ecommerce industry, where many sites use a third-party payment domain such as Google Pay.
When customers make a purchase, they are redirected to a Google Pay domain and then redirected back to the ecommerce site following payment.
Without cross-domain tracking, the user experience is split into 2 unique sessions and the acquisition medium/source for the purchase is set to referral/Google Pay, instead of retaining the original medium/source (which was most likely not referral/Google Pay but something like organic/google).
To set up cross-domain tracking using the Tag Manager:
- Open the Google Analytics settings variable in GTM to configure the cross domain tracking.
- Click on More Settings > Cross Domain tracking
- In the Auto Link Domains field, enter a comma-separated list of domains.
- To receive incoming links from other domains, navigate to More Settings then Fields to Set and add a field with a Field Name of allowLinker and a Value of true.
- Save your changes and publish the container.
Note: The preferred method is to make changes to the Google Analytics Settings variable for cross-domain tracking with GTM, so that changes are shared across multiple tags. In Universal Analytics tags, click Enable overriding settings in this tag to expose the More Settings option.
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