Shopify Migration Case Study: How a Brick-and-Mortar Boutique Moved from Square Online and Boosted Sales by 34%

From Square Online to Shopify: A Brick-and-Mortar Boutique Migration Case Study

When Maison Claret, a women’s fashion boutique in Portland, Oregon, decided to expand its digital presence beyond Square Online, the team faced a challenge familiar to thousands of small retailers: how to migrate an entire online operation — inventory, customer data, and sales workflows — without disrupting day-to-day business. This case study documents the full migration journey, the technical decisions behind it, and the measurable results achieved within the first 30 days on Shopify.

Background: Why Maison Claret Outgrew Square Online

Maison Claret had operated a physical storefront for seven years and added Square Online during 2020 to offer local delivery and curbside pickup. By late 2025, the limitations of Square Online became clear:

• Product variant management was rigid, making it difficult to list items with multiple sizes, colors, and materials.- SEO tools were minimal, resulting in less than 8% of total traffic coming from organic search.- Third-party app integrations were limited compared to Shopify’s ecosystem of over 8,000 apps.- Customer segmentation and email marketing required workarounds through external platforms.The boutique’s owner, Claire Desjardins, set three non-negotiable migration requirements: zero inventory discrepancies during cutover, complete customer purchase history transfer, and no more than 48 hours of online store downtime.

Phase 1: Inventory Sync Strategy

Audit and Data Mapping

Before any migration began, the team exported the full Square Online catalog — 1,247 SKUs across 312 products. Each record was audited for completeness: product title, description, images, pricing, variant options, and current stock levels.

Migration Tooling

The team used a combination of Shopify’s native CSV import and the Matrixify (formerly Excelify) app for bulk operations. Matrixify handled variant-level inventory quantities and mapped Square’s category taxonomy to Shopify’s collection structure.

Real-Time Sync During Transition

For the 48-hour parallel-run window, inventory was synchronized between the physical POS (Square Terminal) and Shopify using Stocky (Shopify’s inventory management tool) with manual reconciliation checkpoints every six hours. A Google Sheet acted as a shared ledger, logging adjustments made at the register that had not yet propagated to Shopify. Result: Post-migration inventory audit showed 99.8% accuracy — only three SKUs had a quantity discrepancy of one unit each, resolved within hours.

Phase 2: Customer Data Transfer

Export from Square

Square’s customer export included 4,812 customer records with names, email addresses, phone numbers, and lifetime purchase totals. However, individual order-line detail was not included in the standard export.

Enriching the Data

To preserve purchase history, the team exported Square’s transaction reports and used a Python script to join customer IDs with itemized order data. The enriched dataset was then formatted to match Shopify’s customer CSV import schema, including tags for customer segments such as VIP, Local Pickup, and Repeat Buyer.

Import and Validation

Customer records were imported via Shopify Admin API in batches of 250 to avoid rate-limit errors. Post-import, the team verified that 100% of email-subscribed customers (2,340 records) appeared correctly in Shopify Email’s subscriber list.

Phase 3: Storefront Launch and POS Cutover

The new Shopify store went live on a Thursday evening after business hours. The team used the Dawn theme customized with brand fonts, homepage video, and a lookbook section. Shopify POS Pro replaced Square Terminal at the register the following morning. Key launch-day actions included:

• DNS records updated to point the custom domain to Shopify.- 301 redirects configured for all existing Square Online URLs to prevent broken links and preserve SEO equity.- Google Merchant Center feed reconnected through the Shopify Google channel app.- Payment gateway switched to Shopify Payments, reducing transaction fees from 2.9% + $0.30 to 2.6% + $0.30 on the Shopify plan.

First-Month Sales Comparison

The following table compares key performance metrics from the final full month on Square Online versus the first full month on Shopify.

Lessons Learned

• Start the customer data enrichment early. Joining transaction-level data to customer records was the most time-consuming step and should begin at least two weeks before the migration date.- Run inventory in parallel, not sequentially. Keeping both systems active for 48 hours prevented stockouts during the transition weekend.- Invest in 301 redirects. Organic traffic gains would not have materialized without mapping every old URL to its new Shopify equivalent.- Plan POS training. Staff needed two practice sessions on Shopify POS before feeling comfortable at the register on launch day.

Frequently Asked Questions

How long does a Square Online to Shopify migration typically take?

For a store with around 1,000 SKUs and 5,000 customers, expect the full process — planning, data preparation, import, testing, and launch — to take three to four weeks. The actual cutover window can be kept to 24–48 hours if data is pre-staged and validated in a Shopify development store beforehand.

Will I lose my customer purchase history when migrating from Square to Shopify?

Square’s standard customer export does not include itemized order history. However, by exporting transaction reports separately and joining them to customer records using a script or spreadsheet, you can preserve purchase history as order records or customer tags in Shopify. Third-party migration apps like Cart2Cart can also automate portions of this process.

Is Shopify POS a viable replacement for Square Terminal at a physical retail location?

Yes. Shopify POS Pro offers feature parity with Square Terminal for most small-to-midsize retailers, including support for exchanges, custom receipts, staff permissions, and hardware peripherals like barcode scanners and receipt printers. The main advantage is unified inventory and customer data between the online store and physical register without third-party middleware.