Does Square use the same test cards as Stripe?

Some numbers overlap (4111 1111 1111 1111 works in both) but Square has its own scenario-triggering cards in the 4000 0000 0000 XXXX range with Square-specific error codes like CVV_FAILURE and ADDRESS_VERIFICATION_FAILURE.

What postal code should I use for Square tests?

Use 11111 for the success card. For the address verification failure card, use a different postal code — that's what triggers the AVS failure scenario.

Do Square test cards work with Square POS?

These cards work with the Square Payments API and SDKs. Square POS uses the Square Reader SDK with hardware; test card numbers apply to software integrations.

Square Test Cards — Sandbox Card Numbers

Verified Square sandbox test cards for the Square Payments API, Web Payments SDK, and In-App Payments SDK.

Last updated: April 2026

verifiedVerified against Square documentation — April 22, 2026

Official docsopen_in_new

Square sandbox uses specific test card numbers for simulating payment outcomes via the Square Payments API, Web Payments SDK, and In-App Payments SDK. All test cards work only in the Square sandbox environment.

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Showing 10 of 10 test cards

Card Number	Network	Scenario	Code	Notes
4111 1111 1111 1111TEST ONLY	Visa	Successful paymentGlobal	—	Any future expiry, CVV 111, postal code 11111.
5105 1051 0510 5100TEST ONLY	Mastercard	Successful paymentGlobal	—	—
3782 822463 10005TEST ONLY	Amex	Successful paymentGlobal	—	4-digit CID: 1111.
6011 1111 1111 1117TEST ONLY	Discover	Successful paymentUS	—	—
4000 0000 0000 0002TEST ONLY	Visa	Declined — do not honorGlobal	GENERIC_DECLINE	—
4000 0000 0000 1000TEST ONLY	Visa	Declined — CVV failureGlobal	CVV_FAILURE	Use incorrect CVV to trigger this response.
4000 0000 0000 1018TEST ONLY	Visa	Declined — address verification failureUS	ADDRESS_VERIFICATION_FAILURE	—
4000 0000 0000 1026TEST ONLY	Visa	Declined — invalid accountGlobal	INVALID_ACCOUNT	—
4000 0000 0000 1034TEST ONLY	Visa	Declined — card expiredGlobal	EXPIRED_CARD	—
4000 0000 0000 1042TEST ONLY	Visa	Declined — insufficient fundsGlobal	INSUFFICIENT_FUNDS	—

TEST ONLY. These numbers will not process real transactions. Use only in Square's sandbox environment with test API credentials.

What it does

Square-specific test cards

Cards that only work in Square's sandbox environment with Square test credentials.

All major decline types

GENERIC_DECLINE, CVV_FAILURE, ADDRESS_VERIFICATION_FAILURE, EXPIRED_CARD, INSUFFICIENT_FUNDS, INVALID_ACCOUNT.

Multi-network support

Visa, Mastercard, Amex, and Discover test cards.

Use CVV 111, postal 11111

Square sandbox recommends CVV 111 and postal code 11111 for most test cards.

How to use Square Test Cards — Sandbox Card Numbers

1
Create Square sandbox credentials
Go to developer.squareup.com, create a sandbox application, and get your sandbox access token.
2
Use recommended test values
Use CVV 111 and postal code 11111 with the success card (4111 1111 1111 1111).
3
Submit via Square SDK
Use the test card with the Web Payments SDK tokenize() method or directly in API calls.
4
Check the error response
Square returns CARD_DECLINED with a specific detail code matching the card's expected scenario.

Square sandbox setup

Square sandbox uses a separate access token from production. Each sandbox application has its own access token in the format sandbox-sq0atb-... Always confirm you're using sandbox credentials. Square sandbox transactions appear in your Square Developer Dashboard under the sandbox tab, not in your production Square Dashboard.

Frequently Asked Questions

Does Square use the same test cards as Stripe?: Some numbers overlap (4111 1111 1111 1111 works in both) but Square has its own scenario-triggering cards in the 4000 0000 0000 XXXX range with Square-specific error codes like CVV_FAILURE and ADDRESS_VERIFICATION_FAILURE.
What postal code should I use for Square tests?: Use 11111 for the success card. For the address verification failure card, use a different postal code — that's what triggers the AVS failure scenario.
Do Square test cards work with Square POS?: These cards work with the Square Payments API and SDKs. Square POS uses the Square Reader SDK with hardware; test card numbers apply to software integrations.