Shopify + Square integration for stores that sell in person and online
We connect Shopify and Square so in-store and online inventory, orders and returns stay aligned. Which system owns what depends on how you sell, and we help you decide.
- Custom or middleware-based
- Shopify and Shopify Plus
- Senior engineers on your project
Test drive our developers. 3 guaranteed hours of free Shopify work.
Hand us a real task and our senior engineers do the first 3 hours on us. No obligation to hire us, just a straight look at how we work.
- Review your integration
- Fix a sync bug
- Plan the data flow
- Check error handling
Who owns what between Square and Shopify
Most in-store plus online problems come from nobody deciding. We write it down before building.
Square owns
- In-person payments and receipts
- Register sales and staff activity
- Tap, swipe and hardware
Shopify owns
- Online catalog and content
- Checkout and shipping
- Online customer accounts
Needs a clear rule
- Inventory counts
- Prices and discounts
- Customer records
- Returns
One unit sold anywhere should show everywhere
Register sale
In Square
Stock adjusts
Counts update
Shopify updated
Availability changes
Online sale
In Shopify
Square updated
Register sees it
Two sales of the last unit can land in the same minute. We design for that race, so one side does not simply overwrite the other.
The problems in-store plus online stores run into
Overselling the last unit
A register sale and a web checkout happen in the same moment, and one customer gets an apology.
Returns across channels
A customer returns an online order in store. Where is the refund recorded, and does the item go back on the shelf?
Prices that drift
A discount applied at the register never reaches the website, or the other way around.
Multiple locations
Square locations and Shopify locations must line up, or counts end up in the wrong place.
How we go live without a bad weekend
- 01
Reconcile starting counts
Both systems begin from a count you trust.
- 02
Match every item
SKUs and variations are paired and checked, not assumed.
- 03
Test with real sales
In-store and online, including returns and exchanges.
- 04
Go live and watch
Early monitoring while volume is still easy to follow.
Frequently asked questions
Can you integrate Shopify with Square?
Yes. We connect inventory, orders, products and customers so in-store and online sales are visible on both sides.
Should I just use Shopify POS instead of Square?
Sometimes. If you are choosing from scratch, Shopify POS keeps everything in one system. If Square is already embedded in your stores, payments or hardware, integrating is often the better move. We will give an honest view for your situation.
How do you prevent overselling?
We keep a clear owner for inventory and design updates so concurrent sales are reconciled instead of overwritten. For fast-moving items, we can also hold back a small buffer for online.
How are returns handled?
We agree where the refund is recorded and whether the item returns to sellable stock. Your policy decides the rule and the integration enforces it.
Does this work with Shopify Plus?
Yes, standard Shopify and Shopify Plus.
Get a quote for Shopify + Square Integration
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