I will setup google analytics 4, ga4 ecommerce tracking, conversion tracking GTM

Google Analytic was never 100% accurate. Before the policy and update, we manage to track 80% or more of the data. After cookie consent and iOS update, if you manage to capture 50% to 60% you should be happy and if you get 80% be grateful.

Most client I worked with use GA as an accounting dashboard. They expect the number to match, but if your conversion rate is 0.7 with traffic of 100, your C.R. will still be 0.7 with traffic of a 1000, no matter how accurate your data. So is irrelevant. GA is to help you answer questions.

In a measurement session, we will go through your website and map out in a Google sheets all the important actions to help understand how your visitors are engaging. We will also discuss advance retargeting strategies to avoid spamming your visitors and reduce ad spent cost.

Depending on your platform and the available information. We can track view item list, select item, view item, add to cart, view cart, begin checkout, add shipping info, add payment info, purchase and more. All this come with product information and values.

I am familiar with both Google cloud and Stap.io. I recommend stape.io for the low cost.