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Square Sandbox

Payments Dev Free key (no card)

AuthenticationFree key (no card)
Rate limitNo published numeric limit for sandbox; default test values apply.

Documentation: developer.squareup.com ยท Checked Sep 13, 2026

About

Square's free developer sandbox gives every registered application an isolated test environment (plus test sellers, payment methods, and webhooks) for payments, orders, inventory, subscriptions, and invoices. Sandbox credentials come from the application dashboard at no cost.

Details

Free to start. You may need a free key, but no credit card.

Auth: Free key (no card)

Rate limit: No published numeric limit for sandbox; default test values apply.

Verified: 2026-09-13

Best for: POS prototypes Invoicing apps Subscription testing

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Setup

  1. Create a free Square Developer account and an application.
  2. Copy the sandbox access token from the app dashboard.
  3. Call https://connect.squareupsandbox.com endpoints with the sandbox token.
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