Google Analytics & GA4: The Complete Setup Guide for E-Commerce

Why Your GA4 Data Is Probably Wrong

GA4 is Google's current analytics platform — it replaced Universal Analytics in July 2023. It's more powerful, but also more complex to configure correctly.

Most stores that "have GA4" are only capturing a fraction of what they should be tracking. Common issues include: missing e-commerce events, incorrect attribution, untagged campaigns, and broken conversion tracking after a Shopify or WooCommerce update.

The 5 Core GA4 Events Every E-Commerce Store Needs

1. view_item — a product page was viewed
2. add_to_cart — product added to cart
3. begin_checkout — checkout started
4. purchase — transaction completed (with revenue, items, transaction ID)
5. conversion events — custom goals mapped to your business objectives

If any of these are missing or misfiring, your funnel data is useless.

GA4 + Google Tag Manager: The Right Stack

The cleanest way to implement GA4 is via Google Tag Manager (GTM). This lets you:

• Deploy tracking without touching code
• Manage all tags in one place
• Add events and custom dimensions without developer involvement
• QA everything before pushing to production

A direct GA4 snippet in your site header works too — but it's harder to maintain and easier to break.

What to Track Beyond the Basics

Once your core events are live, layer in:

• Scroll depth — are users reading your content or bouncing?
• Video engagement — are product videos being watched?
• Form interactions — where do lead gen forms lose people?
• Internal search — what are users looking for that you're not surfacing?
• UTM parameters — are your campaigns tagged correctly so you know what's driving revenue?

The GA4 Audit Checklist

Before trusting your data, run through these checks:

• Is the GA4 measurement ID firing on all pages (not just the homepage)?
• Is enhanced e-commerce tracking active?
• Are purchase events deduplicating correctly (no double-counting)?
• Are your UTM parameters being captured in campaigns?
• Is your conversion window aligned with your actual sales cycle?

Want an Instant Audit for your Business?

Book a 15-minute session to review your GA4 setup directly with Mehdi: calendly.com/mehdi-rooty/15min