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Square

Accept credit card payments on invoices through your Square account

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Connected Account

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Merchant ID: -
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Environment: -
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Taking payments

Open any invoice → Record Payment → choose Square to take a card payment. Refunds go back to the card via the invoice's Refund button (method: Square). Payments appear in the customer's payment history like any other method.

Webhook (recommended)

Webhooks keep payments and dashboard-issued refunds in sync even when the browser closes mid-payment. In the Square Developer Dashboard → Webhooks, add a subscription pointing to the URL below (events: payment.updated, refund.updated), then paste the subscription's Signature Key here.

Notification URL

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Signature Key

Server Setup Required

The server is missing Square app credentials. The platform administrator needs to create an application at developer.squareup.com, set the OAuth redirect URL to <server>/api/v1/square/callback, and set SQUARE_APPLICATION_ID, SQUARE_APPLICATION_SECRET (and optionally SQUARE_ENVIRONMENT=sandbox) in the backend environment, then restart the server.