Square Payments Sync for Shopify

Key Features

Square card processing wired into Shopify checkout via OAuth-authenticated API connection

Bi-directional POS and online inventory sync across Shopify multi-location inventory levels

Webhook-driven stock updates that prevent overselling between register and website

Apple Pay and Google Pay support through Square's digital wallet capability

Unified ledger that reconciles in-store and online sales into one transaction history

Refund and void issued directly from the Shopify admin against the correct Square charge

Customer profile sync so register and online shoppers resolve to one record

Square catalog mapped to Shopify products and variants with linkage stored in metafields

Unified omnichannel reporting across both sales channels

Built on the Shopify Admin GraphQL API with idempotent webhook handlers

Partial and full refund handling with correct ledger and inventory reversal

Per-location configuration for retailers running multiple Square sites

Error logging and retry on failed syncs so a dropped webhook does not desync stock

Tested in a development store and installed by ECOSIRE before go-live

Built to order, done for you

No DIY setup — a working app, built, installed and supported by ECOSIRE.

You order

Start with a one-time build price. We scope it with you at kickoff.

We build & install

ECOSIRE builds, configures and installs it on your Shopify.

Go live + support

You go live in about 2–4 weeks, with a post-launch support window.

About this Product

Square Payments Sync for Shopify is a build-to-order integration for omnichannel retailers who already run Square POS in-store and want Shopify to behave as one connected system instead of a second silo. This is not an instant App Store install — ECOSIRE builds, configures, installs and supports the app for your store, then hands you a tested, production-ready integration scoped to your catalog and locations.

The app authenticates to Square via OAuth and to your store through a custom Shopify app using the Admin GraphQL API. It reconciles online checkout charges and in-store Square POS sales into one unified ledger, so a single sale never gets double-counted and refunds resolve to the right transaction. Inventory stays honest through webhook-driven multi-location sync: when a register sells the last unit, Shopify's multi-location inventory levels update before the next online shopper can oversell it, and vice versa.

Because every retailer's Square setup differs — multiple locations, taxonomy quirks, partial-refund rules, gift-card handling — we map your Square catalog to Shopify products and variants during the build, store linkage in metafields, and confirm edge cases with you before go-live. Apple Pay and Google Pay are enabled through Square's wallet support at checkout. Staff can issue refunds and voids straight from the Shopify admin, and customer profiles sync so a shopper recognized at the register is the same record online.

You get unified omnichannel reporting, a documented architecture, and a real human to call when Square or Shopify ships an API change. Honest delivery: typical build and installation runs 2–4 weeks depending on catalog size and the number of locations.

What you get

Custom Shopify app built to your Square account, catalog and locations

OAuth connection configured between Square and your Shopify store

Multi-location inventory sync with webhook handlers installed and verified

Square-to-Shopify catalog mapping with metafield linkage documented

Refund/void controls surfaced inside your Shopify admin

Unified reporting view across in-store and online sales

Installation into your live store by ECOSIRE after development-store testing

Architecture and configuration documentation plus a post-launch support window

Who this is for

Omnichannel retailer on Square POS

Runs physical stores on Square and sells online through Shopify, and is tired of reconciling two separate sales and stock systems by hand.

Operations or retail manager

Owns inventory accuracy and needs register and website to share one live stock count so neither channel oversells.

Finance lead or bookkeeper

Wants in-store and online payments landing in one ledger with refunds attributed correctly, instead of stitching Square and Shopify exports together at month end.

How Square Payments Sync for Shopify Compares

Criterion	ECOSIRE	Custom Build	Competitor
Square POS and Shopify share one unified ledger	Included	Included	Partial support
Bi-directional multi-location inventory sync	Included	Partial support	Partial support
Refund and void from inside Shopify admin	Included	Partial support	Not included
Built, installed and configured for your exact Square setup	Included	Partial support	Not included
Available as an instant self-serve App Store download	Not included	Not included	Included
Ongoing maintenance against Square/Shopify API changes	Included	Not included	Partial support
No per-developer hourly project management overhead	Included	Not included	Included
Customer profile sync across register and online	Included	Partial support	Partial support

Frequently Asked Questions about Square Payments Sync for Shopify

Is this an instant download from the Shopify App Store?

No. This is a build-to-order integration. ECOSIRE builds the app against your specific Square account, catalog and locations, tests it in a development store, then installs it into your live store. You are buying a custom build and installation, not a self-serve App Store listing.

How long does delivery take?

A typical build and installation runs about 2 to 4 weeks from kickoff, depending on the size of your catalog, how many Square locations you operate, and any custom refund or tax rules. We confirm a firm timeline after a short scoping call and keep you updated through testing and go-live.

What support and updates do I get after launch?

Every build includes a post-launch support window, and ECOSIRE supports the app on an ongoing basis. If Square or Shopify ships an API change that affects the integration, we maintain it. Extended support and enhancement work is available as a continuing arrangement rather than an automatic subscription.

Will it prevent overselling between my register and my website?

Yes. Inventory syncs through webhooks against Shopify's multi-location inventory levels, so when stock changes at the register it updates online before the next shopper checks out, and online sales decrement in-store availability. We add retry and error logging so a single dropped webhook does not leave channels desynced.

Does it work if I have multiple Square locations?

Yes. We configure per-location mapping during the build so each Square site reconciles to the right Shopify location for inventory and reporting. The number of locations is one of the factors that influences scope and timeline.

Can my staff refund or void a Square payment from Shopify?

Yes. Refund and void controls are surfaced inside the Shopify admin and resolve against the correct underlying Square charge, with both the ledger and inventory reversed correctly for full or partial refunds.