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To improve the performance of your ML model and attribution, it’s necessary to implement the tracking of the user ID in Google Analytics.
For GA4 via Tag Manager:
  1. Pass the Parameter to dataLayer: On every page load after login, pass the relevant parameter user_id to your dataLayer.
  1. Create a Variable inside GTM that reads that value from the dataLayer.
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  1. Send the property to Google Analytics via Google Tag Manager (GTM) or gtag.js:
    1. Under the Configuration Parameter section of your GA4 Google Tag, add a new row with the user_id property and the corresponding Value (the Data Layer variable you created in step 2).
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    2. Select the created Event Settings Variable in each GA4 configuration and event tag.
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For GA4 using gtag.js

  1. Config parameter - User ID (user_id)
      2. Pass a unique user ID after login to track users across sessions on different devices.
      • Example for gtag.js:
      javascript
      gtag('config', 'STREAM_ID', {
  'user_id': 'USER_ID' 
});
Identity Graph
Cross-Device Tracking via Email Hash
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User ID
For GA4 using gtag.js