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No, it’s not possible to retrieve a user’s Google Click ID (GCLID) using the Measurement Protocol. The Measurement Protocol is designed for sending data to Google Analytics, rather than pulling data from it. You can, however, send the GCLID in a hit to Google Analytics with the Measurement Protocol using the “gclid” parameter, as long as you are able to capture the GCLID from the landing page URL when a user arrives at your website from a Google Ads click.
