If you’re looking for information on Google’s auto-tagging feature or the gclid query string parameter that Google Ads uses for their Google Click ID in auto-tagging, you’ll want to read this Google support article:
   

If you got to this article because you were wondering what the ClickMagick equivalent is for Google’s Click ID parameter, we also call it a “click ID” and you can pass it in your URLs using a special [clickid] token.

You can read about ClickMagick click IDs in this article:
 

Article 453 Last updated: 12/20/2019 8:22:50 AM
https://www.clickmagick.com/kb/?article=453