Click “Download file”.
Move to Google Tag Manager.
Click "Import Container" in Admin page.
Click "Choose container file", and select the JSON file.
Click "Existing", and select "Default Workspace".
Select "Merge" and "Overwrite conflicting tags, triggers and variables".
Click "Confirm"
Click "Complete" in this app settings page.
Finish
You finished to set up "Google Tag Manager settings" and "Pafit Tag Management".
Check Google Tag Manager's preview and debug mode.
Enter the store URL and click Connect.
You can see fired tags.