• https://www.clickinsight.ca/blog/tracking-on-site-promotions
• https://www.simoahava.com/gtm-tips/use-eventtimeout-eventcallback/
• https://canonicalized.com/enhanced-ecommerce-tag-manager/?section=start-off-right
• https://www.analyticsmania.com/post/google-tag-manager-debug-mode/
• https://www.optimizesmart.com/beginners-guide-google-tag-manager-v2/