Install the Tag Assistant Companion extension in your browser.
Open the extension. Click Add domain.
Enter your website URL and click Connect.
Next, you will now have two tabs:
One with your website and an extra ‘gtm_debug’ query parameter.
One with the tagassistant page as below:
Click Continue.
You can now start debugging, and see the events getting fired (eg. add tickets to your cart).
The result in tagassistant should look as below: