Google Shopping and Performance Max: How They Fit Together
Google Shopping is not a separate advertising platform — it is an ad format. The product card with a photo, price and store name is assembled from the data you send to Google Merchant Center. Google Ads only decides who sees it and at what price.
Performance Max is a campaign type. It uses the same Merchant Center data but distributes it more widely: across Search, the Display Network, YouTube, Discover, Gmail and Maps. Product cards do not disappear — for an online store they remain the core format.
There is one practical conclusion: both standard Shopping campaigns and Performance Max depend on Merchant Center. Until the feed passes review, there is nothing to advertise. That is why we start with product data, not with campaigns.
If you need other formats, see our PPC services or paid social advertising.
Merchant Center and the Product Feed: the Core of the Work
This is the part of the service that is most often underestimated. A campaign in Google Ads can be assembled in an hour; getting a catalogue into a state where it passes review and updates correctly takes considerably longer.
What We Check in the Account
Merchant Center disapproves products for formal mismatches, not for "ad quality". The most common causes:
- the site is not verified, or verification was lost after a migration or a CMS change;
- there is no return policy on the site — Google requires it as a separate, accessible page;
- shipping is not configured: in more than 30 countries this is a mandatory condition for products to show;
- the price in the feed does not match the price on the product page, or is sent without a currency code;
- required attributes are missing: id, title, description, link, image_link, availability, price, brand.
What We Do with the Feed
A feed can come from a CMS, a dedicated module, a spreadsheet or the Merchant API. The source itself does not matter — what matters is what is inside. We:
- rewrite product titles into the word order that works in your niche: brand, model and key specification for electronics; type, brand, colour and size for apparel. The title limit is 150 characters, but shoppers only see the beginning of it, so the decisive part has to come first;
- clean up images Google does not accept: stretched or upscaled thumbnails, photos with promotional text, watermarks or borders, placeholders and generic pictures instead of the actual product;
- verify GTINs — Google asks you to submit them only when you are confident in the value, because a wrong code is worse than none;
- configure feed rules and supplemental feeds, so the export does not have to be rebuilt on the site side where the issue can be solved in Merchant Center;
- segment the catalogue by margin and turnover — this is the foundation for bid management later on.
We also prepare the catalogue for a requirement that takes effect on 31 January 2027: the minimum product image size becomes 500 × 500 pixels. Catalogues assembled a few years ago often fail that threshold, and reworking them in advance is cheaper than doing it when products start being disapproved in bulk.
Free Product Listings
Products in Merchant Center do not only appear in paid ads. Free listings are available on the Shopping tab, in rich results in Search, in Images, on YouTube, in Google Lens and in the product section of a Business Profile. The requirements are the same: policy compliance, a return policy, configured shipping and complete required attributes. Google explicitly notes that display is not guaranteed.
For a store this means one simple thing: Merchant Center is worth getting into working order even when there is no advertising budget yet. We set up free listings as a separate stage of the work, not as a side effect of launching campaigns.
Why Stores Most Often Fail to Show
| Symptom |
What is behind it |
What we do |
| Products marked "Disapproved" |
Policy violations or incomplete feed data |
Work through the specific disapproval reasons and fix the feed or the product pages |
| Account suspended |
Misrepresentation, missing return, shipping or payment information, promoting out-of-stock products |
Bring the site and the account in line with the requirements, then submit a review request |
| Products are active but get no impressions |
Shipping not configured for the region, zero price, "out of stock" status |
Check shipping and tax settings, reconcile availability and price with the site data |
| Price in the ad differs from the price on the site |
Infrequent feed updates, caching, different currencies or member-only pricing |
Set the update frequency and feed rules, align how prices are displayed on the site |
| The wrong products are showing |
The catalogue is not segmented, no negative keywords or exclusions |
Split the catalogue by margin and category, add negative keywords and exclusions |
| Budget is consumed by a handful of products |
A few items absorb the impressions while the rest of the catalogue stays idle |
Move those products into a separate campaign so the rest of the assortment gets exposure |
Google states that Merchant Center suspensions are applied upon detection and without prior warning — there may be no warning email at all. That is why we check the site against these requirements before launch, not after.
Standard Shopping or Performance Max
There is no universally better campaign type. The choice depends on how many conversions the account has, how much control you need and whether creative assets are available.
| Criterion |
Standard Shopping campaign |
Performance Max |
| Where it shows |
Google Search and the Shopping tab |
Search, Display Network, YouTube, Discover, Gmail and Maps |
| What is needed to launch |
Merchant Center and a product feed |
Merchant Center and a feed, plus headlines, descriptions, images, logos and video |
| Bid management |
Manual bids or automated strategies, including target ROAS |
Automated strategies only |
| Serving controls |
Campaign priority, product groups, negative keywords |
Search themes, campaign-level negative keywords, brand exclusions |
| Reporting transparency |
Reports by product group and search query |
Channel performance report and asset group statistics |
| Data required |
Works even with a modest conversion volume |
Needs a steady flow of conversions to learn |
| When we choose it |
You need control over specific product groups and clear search intent |
You need broader reach, have creative assets and enough conversions |
Performance Max used to be described as always taking precedence over a standard Shopping campaign for the same product. Google’s current documentation frames it differently: the campaign with the higher Ad Rank serves, and a Search campaign with a keyword that exactly matches the query is preferred over Performance Max. In practice this means campaign types can be combined, but the account structure has to be deliberate rather than accidental.
What the Service Includes
- Checking the site against Merchant Center requirements: return policy, shipping, payment, domain verification.
- Setting up or restoring the Merchant Center account and linking it to Google Ads.
- Building the product feed, feed rules and update frequency.
- Working through product titles, descriptions, images and attributes.
- Enabling free product listings.
- Structuring the Google Ads account and launching campaigns — Performance Max, standard Shopping or a combination.
- Web analytics setup and conversion tracking with order value passed through.
- Catalogue segmentation by margin, work with negative keywords and exclusions.
- Ongoing bid optimisation, testing and reporting on ROAS and cost per order.
If campaigns are already running and you need to understand what is going wrong, start with a Google Ads campaign audit. If you need broader account work rather than product ads alone, see Google Ads setup.
What We Need from You
- Access to Google Ads, Merchant Center and GA4, or approval to create the accounts.
- Access to the site or a contact on the development side — part of the Merchant Center requirements is met on the site itself.
- Up-to-date shipping, payment and return conditions.
- Margin data by category: without it, a target ROAS is set blind.
- Priority categories and the products you need to sell first.
Who This Service Is For
- Online stores with a catalogue of several dozen products or more.
- eCommerce projects that already receive orders and want to scale advertising.
- Stores with dynamic stock, where assortment and prices change daily.
- Manufacturers promoting their own brand and selling direct.
- Retailers reducing their dependence on marketplaces.
- Stores whose Merchant Center is already suspended or where most products are disapproved.
Product advertising works well alongside organic traffic — see how we handle stores in search on our eCommerce SEO page. If the site is still being built, it is easier to account for feed requirements from the start: we also handle online store development.
How to Get Started
- Send a request through the form on this page.
- On a short call we clarify the assortment, target markets and the current state of Merchant Center and Google Ads.
- We fix the scope, the sequence of work and the cost in a proposal.
- Once approved, we start with Merchant Center and the feed, then move on to campaigns and analytics.
- From there we work in cycles: reporting, optimisation, hypotheses for the next period.
You can see how this plays out on real projects in our PPC case studies and eCommerce case studies.
Want your products to show up in Google, with the budget going to the items that actually turn a profit? Send a request — we will look at the state of your feed and propose a sequence of work.
