Ecommerce Replatforming: What Breaks and How to Protect It

A platform move rarely fails on launch day. The store loads, test orders go through, and the team celebrates. The damage shows up over the next month, when old product URLs return 404 errors, returning customers cannot log in, a subscription renewal does not charge, and, if product IDs changed, Google Shopping campaigns start learning from scratch.

This guide covers what breaks when a DTC brand moves to Shopify, most often from Magento (Adobe Commerce) or WooCommerce, and the checks that prevent each failure. Platform details are as of 22 October 2026.

What breaks when you move an ecommerce platform?

When you move an ecommerce platform, the parts that break are URLs and redirects, customer accounts, recurring orders, product IDs in Google Merchant Center, and the tracking that feeds analytics, ads and email.

None of these show up in a quick test of the new storefront, because each one depends on something outside it. Search engines hold the old URLs, customers hold old passwords, payment providers hold subscription contracts, and Google's systems hold product performance history tied to an ID.

The order of the checks matters too. Shopify asks merchants to import products first, then customers, then historical orders, because each layer links back to the one before it.

URLs and redirects decide how much search traffic survives

Shopify uses a fixed URL structure, so almost every product and category URL from Magento or WooCommerce changes in a move. Products live under /products/ and categories under /collections/, while Magento URLs often carry .html endings and category folders.

Shopify's own Magento migration guide puts it plainly, "Every indexed Magento URL that's changing needs a 301 redirect to its Shopify equivalent." The redirect map is the biggest SEO task in a replatform.

Google recommends permanent redirects such as 301 or 308 and asks site owners to keep them "for as long as possible, generally at least 1 year." It also warns that visibility "may fluctuate temporarily during the move" and gives no figure for how much.

Shopify adds limits that catch teams out.

• A store can hold 100,000 URL redirects, or 20 million on Shopify Plus, according to Shopify's redirect documentation.
• A redirect only fires from a broken URL. If the old path still loads a page, the redirect does nothing.
• Fixed paths such as /products and /collections cannot be redirected away from.

Build the map from every URL that has organic traffic, backlinks or paid clicks, not only from the current sitemap. Test the top pages by traffic first, and avoid chains where one redirect points to another. Google's Change of Address tool is only for moves to a new domain, so a replatform that keeps the same domain does not need it.

Customer accounts and recurring orders

Customer data moves, but passwords do not. Shopify states that customer passwords cannot be migrated by CSV because they are encrypted outside Shopify, so every returning customer needs a way back into an account.

The newer Shopify customer accounts soften this. They sign customers in with a one-time email code instead of a password, while legacy accounts need customers to register again or accept an invite. For most brands, launching on new customer accounts removes the worst of the login problem.

Email and SMS consent travels in two columns of the customer CSV that accept only yes or no. Map these carefully and have whoever owns compliance check the mapping, because a wrong value can either mail people who never opted in or drop people who did.

Subscriptions are the riskiest data to move. Shopify Subscriptions can import contracts from another app only if that app was integrated with Shopify Checkout. A subscription tool built for Magento usually was not, so plan the move with the subscription provider before setting a launch date, including how stored payment methods carry over.

Gift card balances and store credit can move too. Shopify's Plus launch checklist says to migrate gift card data right before launching, so balances spent on the old store in the last days are not lost.

Tracking, ads and email after the move

Product IDs in Google Merchant Center carry the performance history that Shopping and Performance Max campaigns learn from. Google's guidance is direct, "If you change the ID, you'll overwrite your product and its history." Export the old feed before launch and set the new feed source on Shopify to keep the same IDs, using SKUs where possible.

Conversion tracking breaks in a less obvious way. Scripts pasted into thank-you or order status pages stopped working on Shopify after checkout.liquid and additional scripts were sunset, so old snippets copied across will not fire. Shopify sunset additional scripts on those pages in August 2025, and script tags there for non-Plus stores in August 2026. Rebuild GA4, Google Tag Manager and ad pixels through Shopify's Customer events and the official apps, then place test orders and check that each platform records them.

Email flows break silently. Klaviyo notes that a flow trigger cannot be switched to a new metric, so flows triggered by the old platform's events must be cloned onto the new Shopify metrics, or no new contacts will enter them. Metric-based segments need rebuilding too, and deleting old metrics deletes their history.

Reviews need their own plan. Product reviews usually move through the importer of a third-party review app, and the review schema on product pages should be checked after import.

The replatforming checklist

Each risk has a check and a point in the project when it should run. Run every item for the top revenue products and pages before the rest.

Shopify's Store Migration app covers platforms such as WooCommerce, Wix and Square, but not Magento. A Magento move uses CSV exports, a migration partner or the API.

How to know the migration worked

A migration has worked when organic traffic, revenue by channel and feed health hold steady against a baseline taken before launch.

In the four weeks before the move, record organic sessions and revenue in GA4, clicks by page in Search Console, approved products in Merchant Center, and orders by channel in Shopify. Then compare daily for at least the first 14 days. A dip that recovers is normal, while a drop on specific URLs is a redirect problem to fix that day.

Shopify's migration guide suggests a temporary dip of 5% to 10% is common and a sustained drop over 20% needs investigation, though it does not publish the data behind those figures. Treat them as a rough line rather than a benchmark. The few published studies on traffic recovery cover domain changes rather than platform moves, so they do not transfer cleanly to a replatform on the same domain.

Measure AI channels too. After a move to Shopify, check that products are eligible in Shopify's AI sales channels and that AI assistants such as ChatGPT link to the new URLs. How to track AI traffic and revenue in Shopify and GA4 explains the setup, and technical AEO for ecommerce sites covers schema and crawler access on the new theme.

Frequently asked questions

How long should we keep redirects after moving to Shopify?

At least a year, and longer if you can. Google recommends keeping redirects "for as long as possible, generally at least 1 year."

Will we lose SEO traffic when we move to Shopify?

Some movement is normal while Google processes new URLs, and Google gives no standard figure. A full redirect map, unchanged content on key pages and a daily check of 404s help limit the dip.

Can Shopify's migration app move a Magento store?

No. The Store Migration app lists platforms such as WooCommerce, Square and Wix but not Magento, so a Magento move uses CSV files, a partner tool or the API.

Do customers have to reset their passwords?

Passwords cannot be migrated. With Shopify's new customer accounts, customers sign in with an email code instead, so they do not need a password at all.