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Connect Square POS

Connect Square POS to keep online and in-store inventory in sync.

Last updated 2026-05-24

In short

Open Square in Integrations and approve SECND. Then choose the Square location SECND should track.

Before you start

You need owner-level access to your Square account. If you have multiple locations, decide which one SECND should track — you can change this later, but historical sales stay attached to the previous location.

Step-by-step

1.

Open Connect

In the SECND sidebar, click Connect. The page is titled Marketplaces.
SECND Marketplaces page with Connect buttons for every supported platform
2.

Click Connect on the Square card

Find Square under Available and click Connect. SECND redirects you to Square's OAuth screen.
3.

Sign in and approve

Sign in to your Square account and review the requested permissions: read/write items, inventory, and orders, plus merchant profile read. Click Allow. Square sends you back to the Marketplaces page.
4.

Pick your default location

Click the Square card. In the Settings panel, choose the location SECND should treat as the inventory source.

Settings to configure

Open Square in Integrations. Its settings include the fields below.

Currency

Read-only. SECND detects the currency from your Square account on connect. Square accounts are single-currency, so this matches what you set in Square.

Default Location

Which Square location SECND treats as the inventory source. Multi-location shops should set this carefully — sales report against the chosen location, and that's what cross-listing decisions key off of.

Use SKU as Title

When on, SECND uses the Square item's SKU as the canonical title. Useful for shops that catalog by SKU rather than long product names.

Archive After Sale

When on (default), Square items hide from the register and online store the moment they sell, instead of staying visible at zero stock. Most resale shops want this on; turn off if you sell open-stock items like services or made-to-order goods.

Common issues

Related guides

Square Terminal consignment checkout

Pair a Square Terminal and use it for consignment register card payments.

Connect Lightspeed

Connect Lightspeed X-Series so your in-store sales sync to SECND.

Quick Start: Your First 15 Minutes

Sign up, work through the Get Set Up checklist, connect a marketplace, import, cross-list, automate.

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