Refersion tracking scripts are designed to run on a local page environment. They have not been tested using third-party services such as Google Tag Manager (GTM).
While some merchants have managed to successfully run our tracking script via GTM, it is not recommended, and we can’t provide support.
Our recommendation: To be safe, add Refersion’s shopping cart and/or thank you page pixel code directly to your site.
Learn more about ways to track conversions.