Magento 2 Module to implement TAG tracking: https://www.theaffiliategateway.com/uk
The module accepts input in the form of tagrid query string parameter, sets this as a cookie with 30 day expiry. On completed purchase the module requests the tagserve tracking pixel with order detail: number of items, total order value, along with Merchant and Program id (set in Magento admin configuration), combined with tagrid.
composer config repositories.flipmediaco-tagservetracking git https://github.com/Flipmediaco/TagServeTracking
composer require flipmediaco/tagservetracking
https://devdocs.magento.com/cloud/howtos/install-components.html#install-an-extension