Hi there,
I read your requirement regarding implementing tracking of GA in various ecommerce stores.
I am currently working with a web and mobile app analytics based company. I am very well aware about all types of metrics and KPI(s) that are useful in analytics field as per the business of client. I have worked on Google Analytics, Google Tag Manager(client side & server side both), Google Optimize, Google App Script, and other useful such products. Have worked on many custom solutions for various clients based on complex tracking of data for web and mobile apps both. I have also explored and worked on firebase analytics for various clients, and have knowledge of remote config, cloud messaging, crashalytics, dynamic linking campaign attribution and Adjust analytics tools as well.
I will definitely help you to track whatever thing you required.