Migrating to Shopify: What Actually Breaks and How to Prevent It

Platform migrations are the most stressful project in eCommerce. You're moving your entire business -- products, customers, orders, SEO rankings, integrations, and revenue -- from one system to another. And if you mess it up, the damage can take months to recover from.

I've seen brands lose 40-60% of their organic traffic after a botched migration. I've seen Klaviyo accounts disconnect and email revenue drop to zero for weeks. I've seen checkout bugs that silently killed conversions for days before anyone noticed.

At GOSH Digital, we've managed Shopify migrations from WooCommerce, Magento, BigCommerce, Squarespace, and custom platforms. Here's everything that actually breaks during a migration and the exact steps to prevent each issue.

The 5 Things That Break During Every Migration

Let me be direct about this: these five things will break if you don't explicitly plan for them. Not "might break." Will break.

1. SEO Rankings (The Silent Revenue Killer)

This is the one that causes the most long-term damage because you don't feel it immediately. Your site goes live on Shopify, everything looks great, orders are coming in. Then 2-3 weeks later, your organic traffic drops 30%. Then 40%. Then 50%.

Why it happens:

• URL structures change (WooCommerce uses /product/product-name/, Shopify uses /products/product-name)
• Old URLs return 404 instead of redirecting to new URLs
• Meta titles and descriptions get reset or lost
• Internal links point to old URLs
• XML sitemap has old URLs or is misconfigured
• Structured data (schema markup) breaks or disappears
• Canonical tags point to wrong URLs

The fix (do this BEFORE migration):

Step 1: Map every URL. Export every URL from your current site:

• All product pages
• All collection/category pages
• All blog posts
• All custom/static pages

Use Screaming Frog or a similar crawler to get a complete URL list. Don't rely on manual lists -- you'll miss pages.

Step 2: Create a redirect map. Build a spreadsheet: Column A = old URL, Column B = new Shopify URL.

Map every single URL. Every one. A site with 500 products and 50 blog posts has at least 600 URLs that need redirects. Miss one, and anyone with that old URL bookmarked (or any backlink pointing to it) hits a 404.

Step 3: Implement 301 redirects in Shopify. In Shopify admin, go to Online Store, then Navigation, then URL Redirects. You can bulk import via CSV.

For large catalogs (1,000+ redirects), use an app like Redirect Manager or Traffic Control to handle the volume.

Step 4: Preserve meta data. Export all meta titles and descriptions from your current platform. Import them into Shopify. Don't rely on Shopify's auto-generated titles -- they're usually worse than what you had.

Step 5: Verify post-migration. After launch:

• Submit the new XML sitemap to Google Search Console
• Monitor Google Search Console for crawl errors daily for 2 weeks
• Check your top 20 organic landing pages -- are they still ranking? Are they returning 200 status codes?
• Run a crawl with Screaming Frog on the new site and compare against the old URL list

2. Email and SMS (Your Klaviyo Connection)

When you migrate platforms, your Klaviyo integration doesn't magically follow you. It needs to be rebuilt. And if you do it wrong, you lose:

• Active flow triggers (abandoned cart stops working)
• Dynamic product feeds in emails (show broken images or wrong prices)
• Customer event tracking (browse events, order events)
• Segment definitions that reference old platform data
• Forms and popups that were embedded on the old site

The fix:

Step 1: Install the Shopify-Klaviyo integration BEFORE launch. Don't wait until after migration. Set it up on your staging Shopify store so it's ready to go live with the site.

Step 2: Verify data sync. After connecting, check that customer profiles, order history, and product catalog are syncing correctly. Common issues:

• Customer emails don't match between platforms (case sensitivity, typos)
• Order history import only includes recent orders
• Product images or prices don't update

Step 3: Rebuild your flows. Every flow that references platform-specific data needs to be checked:

• Abandoned cart flow: Verify the trigger event is coming from Shopify, not the old platform
• Browse abandonment: Requires Klaviyo's onsite tracking to be installed on the new Shopify theme
• Post-purchase: Verify order confirmation and fulfillment events are triggering correctly
• Dynamic product blocks: Verify that product feeds in email templates pull from the new catalog

Step 4: Test every flow. Before launch, trigger each flow manually:

• Place a test order and verify the post-purchase flow fires
• Abandon a cart and verify the abandoned cart email shows the correct product with the correct image
• Browse a product and verify browse abandonment triggers
• Sign up on a form and verify the welcome series starts

Step 5: Update forms and popups. If you were using Klaviyo forms embedded on your old site, they need to be re-embedded on the Shopify theme. Copy the embed codes from Klaviyo and add them to your new theme. Test on both desktop and mobile.

3. Checkout Experience

Your old platform and Shopify handle checkout differently. If you don't audit the new checkout, you'll have silent conversion killers.

Common checkout issues after migration:

• Missing express checkout options: Apple Pay, Shop Pay, Google Pay -- these can increase mobile conversion by 10-20%. Make sure they're enabled.
• Shipping rate misconfiguration: Your old platform had complex shipping rules. Shopify needs those recreated. Test every scenario: domestic, international, free shipping thresholds, weight-based rates.
• Tax calculation differences: Shopify handles taxes differently than WooCommerce or Magento. Verify rates for your primary markets.
• Discount code migration: Your old codes won't work on Shopify. Recreate active codes or set up new ones. Communicate changes to customers.
• Gift card migration: Gift cards from the old platform need to be imported into Shopify with correct balances.

The fix: Create a checkout testing matrix. Test every combination:

• New customer, returning customer
• Desktop, mobile, tablet
• Domestic shipping, international shipping
• Express checkout (Apple Pay, Shop Pay), standard checkout
• Discount code, gift card, free shipping threshold
• Single item, multiple items

4. App and Integration Ecosystem

Your old platform had apps and integrations. Some have Shopify equivalents. Some don't.

Common integrations that need attention:

| Integration Type | Old Platform | Shopify Equivalent | Migration Risk | |---|---|---|---| | Reviews | Yotpo, Judge.me, Stamped | Same apps (reinstall) | Medium -- review data needs export/import | | Loyalty/Rewards | Smile.io, LoyaltyLion | Same apps (reinstall) | High -- points balances need migration | | Subscriptions | ReCharge, Bold | Same or equivalent | High -- active subscriptions need migration | | Accounting | QuickBooks, Xero | Same (reconnect) | Low -- just reconnect | | Customer support | Gorgias, Zendesk | Same (reinstall) | Medium -- ticket history may not transfer | | Shipping | ShipStation, EasyPost | Same (reconnect) | Low -- just reconfigure | | Analytics | GA4, Segment | Same (reinstall tags) | Medium -- historical data stays but new tracking needs verification |

The critical ones:

Subscriptions: If you have active subscribers, this is the highest-risk integration. You need to migrate customer subscription records, payment methods, and upcoming order schedules. Work directly with your subscription app's migration team. ReCharge and Bold both have migration support -- use it.

Reviews: Your review history is social proof that drives conversions. Don't lose it. Most review apps allow CSV export/import. Verify that reviews are attached to the correct products after migration.

Loyalty programs: Points balances, tier statuses, and reward histories need to transfer. If a customer has 5,000 loyalty points and they disappear after migration, you'll have an angry customer and a support ticket.

5. Customer Accounts and Data

Your customers have accounts on your old platform -- order history, saved addresses, wishlists, payment methods. Some of this transfers. Some doesn't.

What transfers:

• Customer email, name, address (via data export/import)
• Order history (via Shopify's data import tool or migration apps)

What doesn't transfer:

• Passwords (customers will need to reset their password the first time they log in)
• Saved payment methods (PCI compliance prevents this)
• Wishlists (unless you use a wishlist app that supports import)

The fix:

Pre-migration customer communication (2 weeks before): Send an email to your customers:

• "We're upgrading our website! Here's what to expect."
• "You may need to reset your password the first time you log in."
• "All your order history and rewards will be there."
• "If you have any issues, contact us at [support email]."

Post-migration: Set up a self-service password reset flow. In Shopify, you can send account activation emails to all imported customers. Do this the day of launch so they get a "set your new password" email when the new site goes live.

The Migration Timeline: What a Good One Looks Like

Here's the timeline we follow for Shopify migrations:

| Phase | Timeline | What Happens | |---|---|---| | Planning and Audit | Weeks 1-2 | Full audit of current site: URLs, SEO, integrations, data, content | | Shopify Setup | Weeks 2-4 | Store creation, theme setup, product import, basic configuration | | Design and Development | Weeks 3-6 | Theme customization, custom pages, mobile optimization | | Data Migration | Weeks 5-7 | Customer data, order history, reviews, loyalty points, subscriptions | | Integration Setup | Weeks 6-8 | Klaviyo, analytics, reviews, loyalty, subscriptions, shipping | | Redirect Implementation | Weeks 7-8 | Full 301 redirect mapping and implementation | | Testing | Weeks 8-9 | Full QA: checkout, flows, forms, mobile, speed, SEO | | Soft Launch | Week 9 | Launch to a small test audience, monitor for issues | | Full Launch | Week 10 | DNS cutover, full launch, monitoring | | Post-Launch Monitoring | Weeks 10-14 | Daily monitoring of traffic, rankings, conversions, flows |

Total timeline: 10-14 weeks for a standard migration with 500-5,000 products.

For larger catalogs (10,000+ products) or complex integrations (multiple subscription tiers, custom checkout flows), add 4-6 weeks.

The Pre-Launch Checklist (Print This Out)

Before you flip the DNS switch:

SEO:

• [ ] All 301 redirects implemented and tested
• [ ] XML sitemap generated and submitted to Google Search Console
• [ ] Meta titles and descriptions imported
• [ ] Robots.txt allows crawling
• [ ] Canonical tags verified on 10 random product pages
• [ ] Structured data (JSON-LD) present on product pages
• [ ] Internal links updated to new URLs

Email/SMS:

• [ ] Klaviyo integration connected and syncing
• [ ] All flows tested (abandoned cart, browse, welcome, post-purchase)
• [ ] Email templates showing correct product images and prices
• [ ] Forms and popups live on new theme
• [ ] SMS integration verified

Checkout:

• [ ] Test purchase completed with discount code
• [ ] Express checkout options enabled (Apple Pay, Shop Pay)
• [ ] Shipping rates verified for all zones
• [ ] Tax calculations verified
• [ ] Gift cards imported and tested

Integrations:

• [ ] Reviews imported and displaying
• [ ] Loyalty points migrated and visible
• [ ] Subscriptions migrated with correct schedules
• [ ] Analytics tags firing (GA4, Meta Pixel, TikTok Pixel)
• [ ] Customer support tool connected

Performance:

• [ ] Mobile Lighthouse score 85+
• [ ] Homepage load time under 3 seconds on 4G
• [ ] Product page load time under 3 seconds on 4G
• [ ] No JavaScript console errors on key pages

Communication:

• [ ] Customer notification email scheduled
• [ ] Support team briefed on common post-migration issues
• [ ] Team monitoring plan in place for first 48 hours

Post-Migration: The First 30 Days

The first 30 days after launch are monitoring-intensive. Here's what to watch:

Daily for weeks 1-2:

• Google Search Console: crawl errors, indexing status
• Organic traffic (compare to same period last year)
• Conversion rate by device
• Klaviyo flow performance (are emails sending? Are they converting?)
• Customer support tickets (look for patterns -- same issue reported by multiple customers?)

Weekly for weeks 3-4:

• Keyword rankings for your top 20 terms
• Page speed (sometimes it degrades as you add apps post-launch)
• Email deliverability (bounce rate, spam complaints)
• Revenue by channel (is any channel significantly down compared to pre-migration?)

Red flags that need immediate attention:

• Organic traffic drops over 20% week-over-week -- check redirects and crawl errors
• Conversion rate drops over 15% -- check checkout flow, shipping rates, and mobile experience
• Klaviyo flow revenue drops to zero -- check integration connection and flow triggers
• Customer complaints about missing account data -- check data import completion

The Bottom Line

Shopify migrations break things. Every time. The difference between a successful migration and a disaster is whether you planned for the breakage in advance.

Map your URLs. Rebuild your email setup. Test your checkout. Migrate your customer data carefully. Communicate with your customers. And monitor everything for 30 days after launch.

The migration itself is a 10-week project. But the planning you do before it -- and the monitoring you do after it -- is what determines whether you come out ahead or spend 6 months recovering.

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Planning a Shopify migration? At GOSH Digital, we've managed migrations from WooCommerce, Magento, BigCommerce, and custom platforms -- preserving SEO rankings, reconnecting Klaviyo, and protecting revenue throughout. We'll audit your current setup for free and give you a complete migration plan.

Book a free strategy call with Mark

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Mark Cijo is the founder of GOSH Digital, a Klaviyo Gold Partner agency based in Dubai. He helps eCommerce brands migrate, grow, and scale through email, paid media, SEO, and web development.