Verdict

Pick Checkout.com for CVV tests that need fixed outcomes. Pick Authorize.net for a US gateway with a wide feature set and a sandbox that mirrors its production API. Both sandboxes accept only test card numbers. Do not use live card data in either environment.

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Why Checkout.com first for CVV tests

Checkout.com publishes test card numbers with set CVV values. Example: card 4242424242424242 returns a CVV match for CVV 100 and a CVV mismatch for CVV 101. A tester can repeat a CVV failure without changing other fields. The sandbox returns a response code for each case. This makes regression tests for CVV rules direct.

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Authorize.net CVV behavior

Authorize.net uses test card numbers in its sandbox. CVV validation depends on the Card Code Verification setting on the merchant account. In test mode the gateway simulates the card code response. The field must pass format checks: 3 digits for Visa, Mastercard, Discover; 4 digits for American Express. Some test card numbers return a CVV mismatch by design. The sandbox does not check the CVV against an issuer.

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Feature comparison

  • Test card list: Checkout.com lists about 10 card numbers by scheme and outcome. Authorize.net lists a shorter set of test numbers.
  • CVV outcome control: Checkout.com uses distinct CVV values (100, 101, 102). Authorize.net uses card number and account settings.
  • Currency: Checkout.com sandbox supports multiple currencies. Authorize.net sandbox defaults to USD.
  • API style: Checkout.com uses REST with JSON. Authorize.net uses XML or JSON via its API and SDKs.
  • Documentation: both publish test data pages. Checkout.com separates CVV outcomes in a table.

When to choose Authorize.net

Choose Authorize.net when the production stack already uses it, or when you need a US acquirer path and features such as recurring billing, fraud filters, and void/settle controls. Test CVV cases are possible, but the setup takes more steps.

Authorize.Net Test CVV Compared to Real CVV: A Detailed Review

When to choose Checkout.com

Choose Checkout.com when the test plan needs fixed CVV results, multiple currencies, or a REST API. The sandbox returns clear CVV response codes.

Limits

Neither sandbox validates a CVV with a real issuer. Test CVV codes do not predict live approval rates. CVV rules come from the card network and the acquirer. Store no CVV after authorization. PCI DSS requirement 3.2 prohibits storage of the sensitive authentication data after authorization.