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//Push this dataLayer event on every page of the web-app before Google Tag Manager loads, if a user is logged in.
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//Push this dataLayer event on every page of the web-app before Google Tag Manager loads for logged-in users.
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<script>
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window.dataLayer = window.dataLayer || [];
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window.dataLayer.push({
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 'event': 'user_info',
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 'user_id': 'asdf1234'  //Unique user ID of a registered user from the website's database.
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 'userId': 'asdf1234'  //Unique user ID of a registered user from the website's database.
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 });
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</script>