Switching CSS provider without downtime: How to move campaigns safely in 5 steps

What actually happens when switching CSS

Switching updates the Comparison Shopping Service that submits your product data to Google Shopping. It is a simple account assignment.

What changes:

• Merchant Center CSS assignment. Your account submits to the auction through the new CSS immediately after the switch.
• Click price. The CSS discount applies to your CPC straight away across all active target markets.
• Contacts. The new CSS handles your support, invoicing, and customer service.

What does not change:

• Shop system. Your shop system, tracking, and scripts stay exactly the same.
• Merchant Center. You keep your account ID, product feeds, and product IDs.
• Campaigns. Your structure, budgets, bidding strategies, and assets remain unchanged.
• Account history. Conversion data and campaign history stay in your account.

Are campaigns, bidding strategies, and learning phases retained?

Your campaigns keep running without interruption. Smart Bidding avoids a new learning phase, and you keep your existing Performance Max and Shopping campaigns.

Bidding strategies learn from conversion data in your Google Ads account. This data stays intact, while the CSS only supplies the identifier for auction bids.

During the first few days, CPC and impressions will shift favourably. Lower click costs allow your existing budget to buy more clicks as expected.

Migration in 5 Steps

The process is identical whether you advertise directly with Google Shopping or move from another CSS provider.

Step 1: Inventory

Record your Merchant Center ID, active feeds, target markets, and campaign types. Check your current notice period if switching from another CSS to manage billing overlap.

Step 2: Initiate the Switch

Register with the new CSS and submit your Merchant Center ID. We handle the assignment without requiring feed duplicates or paused campaigns.

Step 3: Check Feed and Shipping Information

Review your core settings before switching. Check shipping rates, delivery times, stock availability, and prices for every target market to protect visibility.

Step 4: Switch and First Day Monitoring

The switch happens during live operation. On day one, check product approvals, impression volume, and falling average CPC. Avoid adjusting bids or budgets during this time.

Step 5: Evaluation After Two to Four Weeks

Allow two to four weeks for accurate performance comparisons. Measure CPC, clicks, and revenue across full weekly cycles against historical data.

Timeline: Who Does What, and How Long Does It Take?

You only need around two hours of work. The rest is waiting for the switch and tracking performance.

Checklist Before Switching

• Feed status: Check there are no major disapprovals in Merchant Center before switching.
• Shipping and delivery time: Set these clearly for each individual target market.
• Prices and availability: Ensure your feed matches your shop, especially during active promotions.
• Campaign structure: Record your current setup to compare results accurately later.
• Tracking: Confirm conversion tracking works and remains unchanged before the switch.
• Contract status: Confirm your notice period and billing cycle with your previous CSS provider.

Typical Mistakes When Switching

• Changing feeds during the switch: Complete the switch first, then optimise your feed to isolate results.
• Adjusting bids and budgets: Changing your bidding strategy during the switch hides the true performance impact.
• Running parallel setups: Assign each product to one CSS. Duplicate setups cause tracking errors.
• Evaluating after three days: Very short testing periods only show standard weekday fluctuations.
• Forgetting target markets: The benefit applies across all active countries. Reviewing only your domestic market hides the full gain.
• Leaving shipping details unchecked: Incorrect shipping information is the leading cause of weak Shopping performance.

What the Switch Brings

The switch lowers your cost per click for identical bids. Higher category competition increases your savings and recovers the monthly fee faster.

On a monthly Shopping budget of 1,000, a 20% cheaper click price gives around 200 more clicks for the same spend. Our service costs £17 per month across all target markets, with no setup fee and no minimum contract term.

For most shops, switching is a simple maintenance task. You replace an existing layer and see lower CPC immediately.

Frequent Questions About Switching CSS