Shopify migrations are coming up more and more in retailer conversations. Whatever the driver, the pattern is consistent: platform migrations are a high opportunity, but they are also high risk.
Most performance drops are not caused by lower demand. They usually come from URL changes, broken tracking, feed changes, and campaigns losing the signals they rely on.
Here is how Shoptimised avoided the most common pitfalls for 80s Casual Classics, and what to prioritise if you are planning a similar move.
Shopify is no longer a niche solution. It's now a mainstream eCommerce platform in both the UK and US:
(source: BuiltWith. These are technology detections, not a full census of all retailers.)
Retailers are switching because Shopify:
Takeaway: Shopify enables faster, leaner eCommerce operations.
Tip: Obsess over redirect mapping, crawlability, and content parity.
Common pitfalls include:
Dan, Senior Account Manager at Shoptimised explains:
“The biggest risk is the product ID changing. Your product ID holds the product’s history and influences what Google pushes out. If it changes, you’re starting from scratch.”
Tip: Keep product identifiers stable and validate conversion tracking pre-launch.
One of the most common migration narratives we hear is “we launched and performance tanked”. Often, demand has not changed. Reporting has.
Tip: Set a clear measurement plan, QA across devices, and monitor parity post-launch.
After a platform change, Shopping and Performance Max often change because the feed changes, even when the catalogue looks the same.
Key risks:
Dan shared this insight from 80s Casual Classics’ migration:
“Before launch day, I was in communication with the 80s Casual Classics team, ensuring we had unique identifiers in the feed. This helps protect continuity through the switch. The website migration is only half the job. The other half is making sure Google still understands your products in the same way.”
Ahead of launch, Dan worked with the 80s Casual Classics team to confirm the identifiers needed to maintain stable product mapping.
On migration day, Shoptimised’s Technical Onboarding Manager, Will, switched the feed and began the continuity process. Conversion tracking was monitored immediately post-launch, so any issues could be flagged and resolved quickly with the wider team.
Dan’s advice for any retailer migrating to Shopify:
“Focus on four basics: a stable product identifier strategy, communicate early with partners, validate conversion tracking before launch, and a feed setup that maintains continuity through the switch.”
Shopify migrations do not have to cause performance dips, but they often do when teams overlook the details. Protect URL equity for SEO, protect measurement continuity, and protect product history in the feed. If you are planning a Shopify migration and want a second opinion on feed readiness, measurement, or launch checks, Shoptimised can help you review the setup and validate your data sources in Merchant Centre.
There is a technical switch on the horizon for retailers and agencies managing Google Shopping and Performance Max campaigns. If it is missed, it can quietly disrupt ad delivery.
Google is retiring older versions of its Shopping Content API and moving merchants towards the newer Merchant API as the primary way product data is supplied for Shopping ads.
Google is consolidating product data management so that the Merchant API becomes the unified data source for Shopping ads. Older API versions are being phased out, which means accounts still using the legacy ‘Content API’ pathway need to take action.
Google has already started surfacing warnings to advertisers, which suggests enforcement is close rather than a distant roadmap item.
There are two milestones, depending on your setup. If you have been invited into Google’s Merchant API beta, you may be in the first group.
If you are unsure which group you fall into, do not assume you are safe. Check the feed source inside Merchant Centre.
In Merchant Centre Next, you can verify your current feed source:
If any listing shows Content API, that feed needs attention now.
Shopping and Performance Max are feed-led. When the feed breaks, delivery breaks with it.
Google is specifically calling out the risk of feeds not being reconnected properly during migration. If your Google Ads account uses feed labels, you need to be especially careful. Feed labels are tags used to group products for campaign structure, bidding control, or segmentation in Google Ads.
If labels are not carried across correctly, campaigns can remain technically live but lose the product groupings they depend on. That often shows up as a gradual performance decline or a sudden drop in traffic.
To reduce risk, treat this like a release, not a routine migration:
Google originally outlined this transition in mid 2024, but the recent reminders make it clear the retirement of legacy APIs is approaching quickly.
If your feed connection is not migrated and revalidated in time, campaigns that rely on that feed can fail. You might not spot the issue until impressions and revenue drop.
Confirm your feed source, plan the switch, and re-check campaign configuration afterwards.
In most cases, no changes are needed. Shoptimised output feeds do not rely on the legacy APIs being retired, so this change will not interrupt product data delivery.
If you are not sure which output method you are using, raise a ticket via the Help Desk and the team can confirm your setup.
You will still need to follow Google’s migration requirements if you are currently using Content API. Alongside that, it is worth checking whether you can move to a feed method that is easier to manage and monitor day to day.
A practical option for many retailers is a feed URL generated by your platform or plug-in. For example, WooCommerce feed plug-ins often provide a URL you can add as a data source in Merchant Centre. Update frequency can be lower than an API and varies by provider. Shoptimised refreshes its feed cache four times daily, on average.
If you cannot access a feed URL or file output, contact your plug-in support team or explore alternative plug-ins and feed generation methods available for your CMS.
Once you have an output feed, you can create a new data source in Merchant Centre and use it as your product source. After it passes inspection and begins populating, you can retire the old Content API source so your product data comes from one consistent method.
If you would like a second opinion on your setup, or support moving to a more reliable output method, the Shoptimised team can help you review options and validate your data source in Merchant Centre.
When it comes to managing your Google Shopping budgets in the run-up to Black Friday, the question looms large: should we go early, go all in on Black Friday itself, or reserve more budget for after the promotional period? It's a dilemma that keeps ecommerce managers awake at night. Commit too early, and you risk burning through the budget before the main event. Wait until Black Friday, and you might miss the early-bird shoppers. Hold back for Cyber Monday, and you could be left picking up scraps.
We analysed data from thousands of Google Shopping campaigns between 19th November and 8th December, breaking it down into six distinct periods. Here's what the numbers tell us, and how you can turn these insights into action for a winning Black Friday strategy.
Here's what most advertisers miss: This period was significantly under-invested last year, despite most Black Friday sales already being live and early shoppers actively hunting for deals. Why does this matter? Because consumer behaviour has shifted dramatically in recent years. Shoppers are savvier, more strategic, and increasingly aware that the "best" deals often appear before Black Friday itself. They're doing their research early, comparing prices, and many are ready to buy well ahead of the main event.
The data reveals something striking: this window delivered the strongest Return on Ad Spend(ROAS), the lowest Cost per Click (CPC), and the third highest Average Order Value of the entire promotional period. Think about that for a moment: you're getting better returns, paying less per click, and customers are spending nearly as much as they do on Black Friday itself.
Your move: If strong ROAS is your priority, this is where you need to lean in. While competitors sleep on these early days, conserving their budgets for the "big day, " you have a golden opportunity to capture high-intent shoppers at a fraction of Friday's costs. Consider this your secret weapon: the period where efficiency meets opportunity. Don't just maintain your usual budget during this window; actively increase it. Test higher bids, expand your product coverage, and make sure you're visible when these early shoppers are making their purchasing decisions.
Let's be clear: the sheer volume of demand and revenue available on Black Friday remains unmatched. This is still the Super Bowl of ecommerce, and you absolutely need a healthy budget to cover the full 24-hour period. But here's the catch: despite boasting the second highest Average Order Value, ROAS wasn't as strong as the preceding 10 days. Why? The surge in demand drives up competition in Product Listing Ads, which inevitably pushes Cost per Click higher. Every retailer and their dog is fighting for the same eyeballs, and Google's auction system responds accordingly. This doesn't mean Black Friday isn't worth it far from it. The total revenue opportunity is simply too large to ignore. But it does mean you need to be smarter about how you approach it.
Your move: Revenue attribution will be slow on the day itself, so manage your budget hourly. This isn't a "set it and forget it" day; you need to be actively monitoring performance throughout. Don't let your budget dry up at 3 pm when there's a whole evening of shopping ahead.
Many retailers make the mistake of front-loading their budget, assuming the morning surge is where all the action happens. But shopping patterns on Black Friday are increasingly extending into the evening as people browse on their phones from the sofa after work. Monitor, adjust, and keep feeding the machine throughout the day. Consider setting up automated alerts for when you hit certain budget thresholds, so you can make informed decisions about whether to increase spend or let things coast.
Saturday often becomes the Cinderella of Black Friday weekend and not in a good way. It consistently underperforms, largely because budgets set high for Friday are left unchanged overnight. Here's what happens: retailers set aggressive budgets for Black Friday, the clock strikes midnight, and those budgets roll into Saturday without any adjustment. Meanwhile, consumer behaviour shifts dramatically.
With shoppers hitting the high street the day after Black Friday, online demand naturally dips (unless bad weather keeps people indoors). Physical stores are offering extended sales, the novelty of "Black Friday" has worn off slightly, and many
shoppers who were going to buy online have already done so."
Yet Cost per Click remains elevated from Friday's spike, creating a toxic combination that hammers your ROAS. You're paying premium prices for reduced demand – the worst of both worlds.
Your move: Don't sleepwalk through Saturday morning with Friday's budget. Pull back late Friday evening or first thing Saturday. Be ruthless about this; your ROAS will thank you. Set a calendar reminder for 11 pm on Friday night, or even better, schedule budget changes in advance if your platform allows it. There's no shame in being conservative on Saturday; you can always increase budgets if you see performance
picking up, but clawing back wasted spend is impossible."
In recent years, Sunday has quietly become a dark horse, often outperforming even Cyber Monday. But there's a wild card in play: the weather.
With Black Friday falling on a payday again this year, mild weather could see shoppers flooding physical stores for extended weekend sales. Town centres and retail parks become destinations, with families making a day of it. When the sun's out, browsers are out. Poor weather? That's when online demand surges. Rainy Sundays create a captive audience of shoppers who were planning to go out but are now scrolling through deals from the comfort of home. This weather dependency makes Sunday one of the most unpredictable days of the promotional period, but also potentially one of the most lucrative if you can read the conditions right.
Your move: Watch the forecast religiously in the days leading up. If rain is predicted across major UK population centres, be ready to capture the spike in online traffic as shoppers stay home and shop from their sofas. If it's going to be sunny and mild, consider pulling back and saving your powder for Cyber Monday instead. The key here is flexibility. Have a plan for both scenarios and be prepared to execute on Saturday evening once the Sunday forecast becomes clearer.
Here's where the desk-bound shoppers take over. Traffic and conversions shift heavily towards desktop as people hunt for deals during work hours. While Cost per Click rises again, Average Order Value climbs too, creating a positive impact on ROAS.
Cyber Monday has maintained its relevance precisely because it captures a different type of shopper in a different context. These are people who might have browsed on their phones over the weekend but want the bigger screen and better bandwidth of their office computer to make final decisions. They're comparing specifications, reading reviews in detail, and making considered purchases. There's also a psychological element at play – Cyber Monday feels like the "last chance" for many shoppers, creating urgency that drives conversions.
Your move: Position yourself to capture that crucial 9 am to 5 pm surge. This is office workers on lunch breaks and "strategic bathroom visits"; make sure your campaigns are firing on all cylinders during business hours. Consider dayparting strategies that increase bids during working hours and reduce them outside this window. Your budget will go further, and you'll be matching your ad presence to when your audience is actually shopping. Also, think about your creative messaging and product focus. Desktop shoppers often have different purchase intent than mobile browsers; they might be looking at higher-value items or products that require more detailed research.
Don't write off the post-Cyber Monday period just yet. As the frenzy subsides, Cost per Click begins to fall while demand levels stabilise. This drop in CPC positively impacts ROAS, even though Average Order Value typically decreases during this window. What's happening here is that the casual browsers and bargain hunters have made their purchases, but there's still a segment of shoppers who are either procrastinating, waiting for their payday to clear, or genuinely just getting around to their shopping now. The advertising landscape is also less crowded as competitors wind down their Black Friday campaigns and refocus on regular trading or Christmas campaigns.
Your move: This is where smart merchandising makes the difference. Focus on initiatives that drive up basket value – "buy one, get 20% off" promotions or strategic campaigns targeting higher price points can turn this cool-down period into a profitable extension of your Black Friday success. Consider bundle deals, cross-sell opportunities, or "complete the look" style merchandising. Since your Cost per Click is lower, you have more margin to work with; use it to encourage larger basket sizes rather than just chasing volume.
This is also an excellent time to retarget people who browsed during Black Friday but didn't convert. They've had time to think, the pressure of "limited time offers" has passed, and they might be ready to buy if you can give them a gentle nudge with the right offer.
Black Friday success isn't just about throwing money at Friday itself. The data shows the winners are those who invest early, manage budgets dynamically throughout the weekend, and stay strategic through the following week.
Think of the Black Friday period not as a single day but as a two-week campaign with distinct phases, each requiring different strategies and budget allocations. The retailers who understand this, who can be aggressive when efficiency is high, cautious when costs spike, and opportunistic when conditions favour online shopping, are the ones who'll come out ahead.
The opportunity is there. The data proves it. The question is: will you seize it, or will you follow the crowd and under-invest in the periods that matter most?
