Working with Comparison Shopping Services

Comparison Shopping Services (CSSs) can place Shopping ads and free product listings on Google on behalf of merchants in the following countries: Austria, Belgium, Czechia, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.

There are many CSSs, including Google Shopping. CSSs offer different areas of expertise, services and charging models.

You need to work with at least one CSS to place Shopping ads or free listings. You can work with several at the same time if you prefer. This article provides an overview of some of the different setups that we've seen CSSs offer, and information on how to work with a CSS. Learn more about advertising with Comparison Shopping Services.

Finding a CSS

You can find eligible CSS partners on Google's Comparison Shopping Partners portal. Filter by one or more countries, industries or supported languages to find CSSs that fit your specific needs. You can also set filters to search for partners that offer API feed technology or for premium partners that have additional technical certification and offer conversion tracking for merchants.

CSS service models

There are a number of different ways in which CSSs and merchants can agree to work together. Any given CSS might offer multiple service models or tailor services to your specific needs.

Some specialise in specific categories (clothing, for example). Some manage feeds and campaigns for you, while others provide tools for you to manage your product data and bidding strategies yourself. Hybrid models exist as well, and CSSs may offer a variety of additional services. Some CSSs charge a fee per click, while with others you might pay a commission when a click on an ad leads to a sale. Combining the strengths of several CSSs can increase the overall performance of your Shopping ads.

Managed service

In this case, the CSS creates a Merchant Center account and a Google Ads account on your behalf. You provide your product data to the CSS, and they optimise your feed, upload it to Google and manage your campaigns. Some CSSs may also use your product data to generate leads for you from other channels.

Google will invoice the CSS for clicks on the ads that they place on your behalf. The cost that Google charges the CSS will depend on the outcome of the ad auction. The CSS in turn will charge you. The pricing model will depend on the agreement you have with that CSS. For example, some CSSs may charge a fixed price per click, some a different click price by category, and some a commission only when a click leads to a sale.

The CSS typically provides you with reporting of the performance of their activities and the associated cost, potentially across the different channels that they use. In this model, you won't normally have access to the Merchant Center and Google Ads accounts that the CSS runs on your behalf, but you may have access to tools that the CSS provides.

Self-service

In this case, the CSS creates a Merchant Center and a Google Ads account on your behalf and then gives you access to these accounts. Another alternative is to switch your existing account from one CSS to another. You manage your feeds and campaigns yourself.

Google will invoice the CSS for clicks on the ads that they place on your behalf. The cost that Google charges the CSS will depend on the outcome of the ad auction. The CSS in turn will charge you. The pricing model will depend on the agreement you have with that CSS. In this model, the CSS typically charges a fixed-percentage markup on the CPC paid in the Google auction. Other pricing schemes exist. Some CSSs enable merchants to directly pay their Google Ads invoice and charge separately for the CSS's services.

You typically have direct access to reporting in Merchant Center and Google Ads. The CSS may provide additional reporting on the performance of the campaigns and the associated cost. Some CSSs may provide consulting services to assist you with your Shopping ads activity.

Hybrid models

These models combine aspects of managed service and self-service models. For example, a CSS may manage and optimise your product data feed, but you run the campaigns yourself. Or the other way around: you manage your feed yourself, while the CSS runs the campaigns for you.

Variants of these hybrid setups involve the CSS creating a new Merchant Center account on your behalf, which you then link to an existing Google Ads account. This way, you can use your existing Google Ads account to manage Shopping ads placed through the CSS.

Other variants involve Google invoicing you directly for ads by a CSS. This may be a more suitable setup if you manage your Shopping campaigns yourself. In these cases, the CSS typically invoices you separately for their services.

Some CSSs might offer additional services beyond those described above.

Using conversion reporting and auto-bidding

Whatever model they offer you, all CSSs have access to the same features, including conversion reporting and Google's auto-bidding tools.

If you'd like to use conversion reporting and auto-bidding with a CSS, there are several ways, including:

Add a Google Ads conversion tracking tag to your website

You add a Google Ads conversion tracking tag, or code snippet, to your website for the CSS that you'd like to work with. Based on this conversion data, the CSS can then run auto-bidding campaigns on your behalf.

Learn more about setting up adding conversion tracking to your website.

Share conversions via a Google Ads manager account

If you've already set up conversion tracking with one CSS, you can share this conversion data with another CSS. To do this, the new CSS links the Google Ads account used for your new campaigns to your Google Ads manager account (if you don't have one, you can create one). The new CSS can then run auto-bidding campaigns based on this shared conversion data.

Learn more about cross-account conversion tracking.

Share conversions via Google Analytics

If you're importing conversion data in your Google Ads account using Google Analytics, you can also use this method with CSSs by linking the Google Ads account used for your campaigns to your Google Analytics.

Using third-party bidding tools

CSSs can also use any third-party bidding tools compatible with Google Ads and Shopping campaigns. In a managed service model, the CSS uses the third-party tool to manage bids on your behalf. In a self-service model, you use the third-party tool yourself to place bids through the CSS.

Placing products beyond general search

By default, a CSS can place products only in the Shopping unit on Google's general search results pages in CSS programme countries.

Some CSSs opt in to placing products also on the Display network and on other surfaces beyond Google's general search results pages (such as the Shopping tab, YouTube and more) in CSS programme countries. If you work with one of these CSSs, they can place products on your behalf on Google's general search results pages and these other surfaces, for any feature available on those surfaces.

Using free product listings in Europe

If you'd like to place products in free listings, you can do so through any CSS in Europe. You can select only one CSS to use for free-of-charge listings in Europe in your CSS dashboard.

Placing products outside Europe

You can choose only one CSS to place products for you in Shopping ads and free listings outside Europe. You can change this selection in your CSS dashboard.

Switching an account from one CSS to another

If you'd like to keep an existing Merchant Center account, but work with a different CSS, you can request to have your account switched from one CSS to another. Ask your new CSS to initiate the switch. After the CSS has initiated the switch, it can be approved or declined by a Merchant Center account admin. Note that a Merchant Center account can be associated with only one CSS at a time.

Google Ads accounts don't need to be switched. Your Merchant Center account determines which CSS your Shopping ads and free-of-charge listings are associated with. If you use product data from a Merchant Center account that is associated with a specific CSS for any campaign in any Google Ads account, that campaign is considered to belong to the associated CSS.

If you switch a Merchant Center account from one CSS to another, note the following:

Products shown on dynamic remarketing and surfaces beyond general search: If the CSS you switch to isn't opted in to serving ads on dynamic remarketing and surfaces beyond general search, your products will only appear on Google's general search results pages and will stop being served on other surfaces.

Placing products outside CSS programme countries: If the switched Merchant Center account contains product data for countries where the CSS programme isn't available, these ads and free listings will stop serving if the new CSS hasn't chosen to place Shopping ads and free listings in those countries. If you want to continue to place Shopping ads and free listings both in countries where the CSS programme is available and in countries where it's not, you have two options:

Create a new Merchant Center account with your old CSS for your product data for countries where the CSS programme isn't available. Switch the existing Merchant Center account to the new CSS to place ads and free-of-charge listings in CSS programme countries.
Ask the new CSS to create a new Merchant Center account for your product data for CSS programme countries. Keep the existing Merchant Center account with the old CSS to place ads and free listings in countries where the CSS programme isn't available.

Note: When initiating a switch, a CSS can also request to change your account setup. Your Merchant Center account can be associated with a CSS as a standalone account, or it can be a sub-account of a multi-client account (MCA) that is associated with the CSS. In the latter case, MCA users automatically have access to your account.

Admins can review the access settings to your Merchant Center account for your CSS on the 'account access' page in Merchant Center to ensure that the settings reflect your and your CSS's needs.

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