GTM event not firing from custom pixel

Ask & Offer

Topic summary

A user implemented Google Tag Manager (GTM) code in a Shopify custom pixel following official documentation, but the GTM event wasn’t triggering when checkout completed, despite the pixel receiving the event.

Key Points:

  • Custom pixel receives checkout completion events but fails to fire corresponding GTM events
  • Screenshot provided showing the pixel configuration

Resolution:

  • Initially explained that Shopify custom pixels operate in a sandbox environment where purchase events and tag firing cannot be previewed in standard ways
  • Events must be verified through browser console instead
  • Issue ultimately traced to a problem with the Google tag itself
  • Status: Resolved - the Google tag configuration was corrected
Summarized with AI on October 26. AI used: claude-sonnet-4-5-20250929.
1

We have added the gtm code as per the tutorial here

gtm
gtm2507×1524 433 KB

on pixel, when a checkout completes, it receives an event but it doesnt fire the GTM event. Attached a screenshot

3

HI,

Thanks for your query.

Shopify custom pixel work on sandbox environment.
You can not preview the event of purchase and tag firing status.
you can check the event from console

Thanks

1 Like
4

How to fire the GTM event once event is received?

7

Yes, there was some issue with the google tag.