GA4 Shopify setup: six steps, and what drifts later

The short answer

Setting up Google Analytics 4 on Shopify is six steps. Create a Google and Analytics account. Create a GA4 property. Add a web data stream. Install Shopify's Google & YouTube channel to connect it. Set how long GA4 keeps detailed data. Then check data is actually arriving before anyone trusts a number.

The setup is the easy part. The hard part comes months later, when GA4 and Shopify disagree and nobody remembers which time zone, currency or retention period was chosen. So write each one down as you go.

The six steps

1. Create the accounts. You need a Google account, and one you already use for Gmail or Google Ads works. Then create a Google Analytics account.
2. Create a GA4 property. In Analytics, go to Admin, click Create, then Property. Enter a name and choose the reporting time zone and currency. Write both down.
3. Add a web data stream. In Admin, under Data collection and modification, open Data streams, click Add stream, then Web. Enter your store's web address and a name. Copy the ID that starts with "G-". Google calls it the Measurement ID and Shopify calls it the Tag ID. It is the same thing.
4. Connect it to Shopify. Install the Google & YouTube sales channel on your store, then follow Google's "Shopify: Set up your Google tag" steps. You do not need to connect Google Merchant Center for this.
5. Set data retention. In Admin, find Data retention and change it from 2 months to 14 months. The next section explains what this actually affects.
6. Check data is arriving. Wait up to 30 minutes, then open GA4's Realtime report and browse your store. You should see yourself appear.

Choose the time zone carefully, because it decides which day a sale lands on. Google's example: if a visitor shops on a Tuesday in their time zone but it is still Monday in yours, the visit is recorded as Monday. Changing the time zone later only affects data from then on, so you can end up with a gap or a spike on the day you change it. Match it to your Shopify store's time zone from the start.

Data retention, stated accurately

GA4 keeps detailed data about visitors and events for 2 months unless you change it. On the free version you can raise that to 14 months.

It is worth doing, but it is often described as more urgent than it is. Google's own documentation says this setting does not affect standard reports. It only affects explorations and funnel reports, the more advanced analysis tools. Your normal traffic and sales reports keep their history either way.

Two more facts that take the pressure off. When you increase the period, Google applies it to data you have already collected and not yet deleted. And any change waits 24 hours before it takes effect, so a mistake can be reverted.

So set it to 14 months on day one, because there is no reason not to. Just do not panic if you find a property still on 2 months.

Checking it works

Seeing yourself in Realtime proves data is flowing. It does not prove purchases are recorded correctly. For that, place a real test order.

1. Place a real order through your storefront, then cancel and refund it.
2. In GA4's Realtime report, check a purchase appeared.
3. Check its value and currency match the order in Shopify.
4. Check there is one purchase, not two. If there are two, you probably have a second copy of the Google tag installed alongside the Google & YouTube channel, and one needs removing.

If a purchase never appears, or the value is wrong, that is the point to bring in a developer or the support team for your tracking setup. Diagnosing tracking code is not a job to learn under pressure.

Why the numbers never match

GA4 and Shopify will never agree exactly, and that is normal. Shopify lists the reasons itself:

• Google counts every page reload, while a browser may not count reloads of cached pages.
• The two define a session differently, for example whether search bots count as visitors.
• Google can only count visitors who allow JavaScript and cookies.
• Some customers use browser extensions that block Google Analytics.
• The two may be set to different reporting time zones.

So use Shopify for the true order and revenue count, and GA4 for where visitors came from and what they did. A gap of a few percent is expected. A gap that suddenly widens is a sign something in the setup has changed.

What drifts later

A GA4 setup that was right at launch can quietly go wrong. The usual causes:

• A new app adds its own copy of the Google tag, and purchases start counting twice.
• Someone changes a checkout or tracking app, and purchases stop arriving.
• The GA4 time zone or currency no longer matches the store, for example after expanding into new markets.
• Google or Shopify moves a setting, and the steps in your notes point at a screen that has changed.

None of these produce an error message. You only notice when a report looks wrong, which is usually long after it started.

What to write down

Keep a short record next to the setup steps. These values do not go stale. They become the evidence when something else does.

Re-check after any new app that touches checkout, any change to your Google & YouTube channel, and any time GA4 and Shopify suddenly drift further apart.

This is where ReccordSOP helps. Record yourself running through the setup and the test-order check once, and it becomes a step-by-step SOP with a screenshot of each step and the clicked button highlighted. Record it again after Google or Shopify changes a screen, and it shows which steps changed instead of overwriting the old version. It documents the process. It does not watch your GA4 or Shopify settings for you.

Start this week. Open GA4, write down the G- ID, time zone, currency and retention period, then place one test order and confirm the purchase arrives with the right value. That single check tells you whether the setup you think you have is the one you actually have.