How to track GTM on the post-purchase page
To track your GTM on the post-purchase page, go to your Shopify Admin > Settings > Checkout > Post-purchase.
There you will find a field for 'additional scripts'. Here you can add your GTM tracking code and click 'Save'

There you will find a field for 'additional scripts'. Here you can add your GTM tracking code and click 'Save'

Updated on: 09/05/2023
Thank you!