A tag is a piece of code that sends information to a third party, such as Google Analytics.
On May 2017 Google Tag Manager have been update the Google Analytics Tracking code and variables, now the Ecommerce settings and Datalyer settings have your configuration under the Google Analytics Settings Variables, check this update on Deploying Google Analytics
Google Tag Manager allows you to deploy Google Analytics using the Universal Analytics template. To install a Google Analytics tag for WHMCS, create a new tag and select Google Analytics as the tag type. Select the trigger checkout for the tag to fire.
WHMCS Enhanced Ecommerce
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