Ecommerce marketing is the set of actions that bring the right people to your online store and get them to buy. The order that usually works starts with the product feed in Merchant Center, moves on to Google Shopping and Performance Max, depends on tracking every purchase with its value, and only then adds remarketing, content, and email. Skip the feed and tracking, and you pay Google to learn from bad data.
Most small online stores do the opposite. They open Instagram, post products, pay for a boost, and only then think about measuring. The result is a store with followers and few sales you can actually explain.
This ecommerce marketing guide follows the order that makes sense for anyone selling physical products with inventory and a price on the page.
Which channels make up ecommerce marketing
Each channel has a role, and mixing up the roles is what makes budget get lost. Think of three moments for the customer: they search, they compare, and they come back.
| Channel | Role | When it comes in |
|---|---|---|
| Google Shopping | Shows product, photo, and price to people who are searching | First, with the feed ready |
| Performance Max | Expands the catalog to more places on Google | After purchases are being measured |
| Remarketing | Brings back people who viewed but didn’t buy | When there’s visit volume |
| Content | Makes the brand remembered and answers questions | In parallel, no rush |
| Sells again to people who already bought | From the first sale |
The table already shows why digital marketing for ecommerce isn’t a list of social networks. The foundation is what Google reads from your catalog and what your store reports about each sale.
Merchant Center and feed: the foundation of ecommerce marketing
Merchant Center is the account where you send your products to Google, and the feed is the file or connection that carries that data. Without an approved product there, there’s no Shopping ad and no Performance Max with a catalog.
The Merchant Center Help Center describes the ways to submit products. Google can detect items from your site’s structured data, you can integrate a store platform, upload a file, use a Google Sheet, enter products manually, or use the API. The choice depends on catalog size and platform. A store with a few items does fine with a spreadsheet. A store with thousands of items needs an integration.
The feed is where most problems start. Google’s recommendations for those using Performance Max with a feed point to four things to watch:
- Complete descriptions, with price and availability updated whenever something changes.
- Images of 500 x 500 pixels or larger.
- Checking the product issues column, which shows missing attributes.
- Shipping and return ratings, when the store has terms that help sell.
Product titles deserve separate attention. The title is what appears in the ad, and “Men’s Black Cotton T-Shirt Size M” sells more than “T-Shirt 04”. The same goes for the category and the GTIN code, when the product has one.
To understand what Google requires before approving an ad, the guide on Google Shopping and what Merchant Center requires covers it step by step.
Google Shopping and Performance Max: when to use each
Google Shopping is the campaign that shows the product with a photo and price right in search. Performance Max is the campaign that uses the same catalog to appear in more places on Google, with AI deciding where and how.
To create a Performance Max campaign with products, your Google Ads account must be linked to your Merchant Center account, as the Google Ads Help Center states. Google also recommends letting the campaign run for at least 6 weeks, so the AI has time to collect and compare data.
In practice, a new store usually gains time by starting with Shopping, which is simpler to understand and control. Performance Max comes in once conversions are being measured and there’s enough order volume for the AI to learn. It’s neither bad nor a miracle, and the article on when to use Performance Max and when it burns your budget details the signs for each case.
A note on order. If the store doesn’t have purchase tracking yet, neither campaign should go live. The reason comes in the next section.
Purchase tracking with value: the difference between selling and guessing
Purchase tracking with value is the conversion that records each order along with how much it cost. Without the value, Google knows a sale happened, but treats a R$40 order and a R$900 order as if they were the same.
The Google Ads Help Center says that when you use conversion tracking, you can assign the same value to all conversions or allow different values. For retailers, it says it is highly recommended to report specific transaction values when customers buy items at different prices and the goal is to maximize revenue. This is on the page with Performance Max optimization tips with a Merchant Center feed, which also recommends setting up optimized conversions for more accurate tracking.
For your store, this means setting up three things.
- The purchase event on your site, with value, currency and order number, sent through the data layer. The guide to events in GA4 shows what this event is called and what it carries.
- The purchase conversion in Google Ads, linked to that event through Tag Manager, as in the step-by-step guide to Google Ads conversion tracking with Tag Manager.
- Enhanced conversions, which help recover purchases the tag would otherwise miss. The topic is covered in enhanced conversions in Google Ads.
Two simple tests before you spend. Make a test purchase and check that the value arrived correctly in Google Ads. Then check that the same order isn’t being counted twice, which happens when the event fires again on a reload of the thank-you page.
If this part of your store is a mess, the conversion tracking with GA4 and GTM service exists precisely for this.
Remarketing: bringing back people who already viewed the product
Remarketing means showing ads to people who visited your store and left without buying. In ecommerce, most visits end this way, which is why this list is usually the cheapest to convert.
Google uses these lists in two ways. In Performance Max campaigns, it suggests using remarketing lists, customer lists and similar segments as signals so the AI learns faster. In dedicated remarketing campaigns, you have more control over the message.
It helps to split the audience by behavior. Someone who viewed a product deserves an ad for that product. Someone who added it to the cart deserves a reminder about shipping or delivery time. Someone who already bought should be removed from the list, or they’ll see an ad for something they already have. The article on remarketing and retargeting in paid search covers this setup in detail.
A list only works if the site measures visits properly, and that takes us back to tracking.
Content and email: what sustains your store between ads
Content and email don’t replace ads, but they reduce how much your store depends on them. Ads pay per visit. Content and email work with people who already know the brand.
For content, a store gains more by showing the product in use than by repeating the catalog photo. What to post, and why, is in content for stores on Instagram. To think about the whole picture, the content funnel separates what attracts, what convinces and what sells.
In email, three messages pay for any tool.
- Abandoned cart, sent a few hours after the visitor leaves.
- Post-purchase, with delivery time, how to use the product and a request for a review.
- Replenishment or complementary product, sent when the customer is likely to need it again.
Customer service is part of marketing too. A store that answers questions quickly sells more, and many people prefer to ask by message before buying. The article on Google Ads for WhatsApp shows how to measure who reaches out from an ad.
In what order to build marketing for an online store
Order matters more than budget. A store with little money and the right order learns more than one with a lot of money and the wrong order.
- Fix the feed and get products approved in Merchant Center.
- Measure the purchase with value, and test it with a real order.
- Launch Google Shopping with a few products and a controlled budget.
- Add Performance Max once you have measured orders.
- Build remarketing by behavior.
- Keep content and email running in parallel from the start.
The next question is usually how much to invest. The answer depends on margin, order value and competition, and the article on how much to invest in Google Ads shows how to think about the number without guessing.
Most common mistakes in online stores
A few mistakes repeat across the store accounts that come in for review.
- Launching a campaign without checking disapproved products in Merchant Center.
- Counting a cart visit as if it were a sale.
- Using a fixed conversion value in a store with products at very different prices.
- Changing the Performance Max campaign every two days, without waiting for the learning period.
- Advertising a product that is out of stock or priced differently from your site.
- Judging the channel only by the last click, without considering that the customer saw the product in more than one place.
Frequently asked questions
What is ecommerce marketing? It is the set of actions to bring visitors to your online store and convert them into buyers, including product feed, ads, tracking, remarketing, content and email.
Where should I start with digital marketing for ecommerce? With the feed in Merchant Center and tracking the purchase with value. Without both, campaigns learn from incomplete information.
Google Shopping or Performance Max, which one should I choose? For a new store, Google Shopping is usually the more controllable starting point. Performance Max comes in once the purchase is measured and there is enough order volume for the AI to learn.
Do I need Merchant Center to advertise on Google Shopping? Yes. Your products must be approved there, and your Google Ads account must be linked to it.
How long does a Performance Max campaign take to deliver results? Google recommends running the campaign for at least 6 weeks so the AI can collect data. Making changes before that usually disrupts learning.
Where to start
If your store’s ecommerce marketing already includes ads, the free Google Ads audit shows how your account is measuring sales and where your budget is going. If you’d rather have someone handle the campaign and the measurement, check out Ciclicko’s Google Ads management.