How to set up order tracking in Google Ads so your ads see sales

Your Google Ads account shows clicks and spend, but how many orders came from it is often unclear. Without purchase tracking, ads run blind: Google doesn't know which searches and products make money, so it spreads the budget across everything. Here's what to track, how to set it up for your store and which mistakes happen most often.

1. Why your ads need to know about orders

Google Ads learns from the data you send it. If the account only sees clicks, the system looks for people who like to click. If it sees orders with their value, it looks for people who buy, and it can raise bids on products that sell and lower them on products that only eat the budget.

Without tracking you also can't honestly calculate return on ad spend: how much revenue each dollar or euro of advertising brings. Decisions like "add budget" or "pause the campaign" become guesswork.

2. What counts as a conversion for an online store

A conversion is any action you consider valuable. For a store, split them into two groups:

• Primary: the purchase (a completed order) with its value and order ID. This is what bid strategies should optimize for.
• Secondary: add to cart, begin checkout, phone clicks, form submissions, clicks to WhatsApp or Telegram. They're useful in reports, but in Google Ads they should be marked as secondary so they don't mix with sales.

If most of your orders come by phone or messenger rather than through the cart, track clicks on the phone number and messenger buttons. It's not a perfect picture, but far better than nothing.

Not sure what your ads are counting?I'll check the tracking in your Google Ads account for free and tell you what to fix first.

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3. 3 ways to set up tracking

1. The Google Ads tag on the order confirmation page. The most accurate option: the conversion is recorded at the moment of purchase together with the order value and ID. Installed directly in the site code or through Google Tag Manager.
2. Importing from Google Analytics 4. If GA4 already records the purchase event correctly, you can import it into Google Ads. Convenient when analytics is already set up, but data arrives a bit slower.
3. A built-in platform integration. On Shopify it's the official Google app, on WooCommerce the Google for WooCommerce plugin. Wix, Squarespace, BigCommerce and Prom have settings fields for Google Ads or GA4 codes. What exactly is sent (order value, order ID) depends on the platform, so always check after connecting.

4. Step by step: a Purchase conversion in Google Ads

1. In Google Ads go to Goals → Conversions → Create conversion action → Website.
2. Choose the Purchase category.
3. Value: "Use different values for each conversion", so the real order total is sent in your store currency.
4. Count: "Every" (each order counts separately for purchases).
5. Add the order ID (transaction_id) to the tag. Then if a buyer reloads the thank-you page, the order won't be counted twice.
6. Turn on enhanced conversions: they send the buyer's hashed email or phone and help keep orders when the browser blocks cookies.
7. Install the tag on the thank-you page (manually, through Tag Manager or a platform integration) and make sure the purchase is set as a primary action.

5. How to check that everything is counted correctly

• Place a test order and check in Google Tag Assistant that the tag fired once and sent the order value.
• A few hours later, look at the conversion status in Google Ads: it should change to "Recording conversions".
• Once a week, compare conversions in Google Ads with real orders from ads. A small difference is normal, but 2-3 times more means double counting.

6. 6 common mistakes

1. One purchase is counted two or three times. For example, the Google Ads tag, the GA4 import and a platform action are all set as primary. In one ventilation store I worked with, the account had three identical Purchase conversion actions, and the Maximize conversion value strategy was running even though Google Ads hadn't recorded a single conversion. We kept one primary purchase action from GA4 and temporarily switched to a strategy with a max CPC limit until enough data comes in.
2. Opening the cart or any page counts as a conversion. The ads look great on paper and buy the wrong people.
3. A fixed value instead of the real order total. Then you can't compare cheap and expensive products.
4. No order ID. Reloading the thank-you page creates a duplicate conversion.
5. Secondary actions set as primary. Carts and calls mix with purchases, and the strategy optimizes for the wrong thing.
6. Cookie consent is ignored. Visitors from Europe need a consent banner and Consent Mode v2, otherwise part of the data won't be sent.

For other settings that make ads spend money without orders, read "Why Google Ads eats your budget".

In short

1. Without order tracking, Google Ads optimizes for clicks, not sales.
2. The primary conversion is a purchase with its value and order ID. Everything else is secondary.
3. Set it up with the Google Ads tag, a GA4 import or a platform integration.
4. Test with a real order and compare with actual orders every week.
5. The most common mistake: one purchase counted several times.

FAQ

Roman SEO

I set up Google Shopping, Google Ads and SEO for online stores and small businesses. I write in plain language, no fluff. If something from this article doesn't work for you, message me and I'll help.

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