CVV test simulation is the use of fake card numbers in a payment processor sandbox. The goal is to confirm that a checkout form collects the security code, that the gateway passes it, and that the response handler prints the correct message. No issuer is contacted. No funds move.
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What the simulation covers
A sandbox test exercises four steps: form validation on the client, tokenization at the gateway, the authorization request, and the display of the result. Test card numbers such as 4242 4242 4242 4242 (Visa) and 5555 5555 5555 4444 (Mastercard) pass the Luhn check by design, so the form accepts them.
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Test CVV values
- Visa and Mastercard test cards carry a 3 digit code. Any 3 digits pass in most sandboxes.
- American Express test cards carry a 4 digit code. 3782 822463 10005 is the standard Amex test PAN.
- Some gateways pin values. 000 returns a match. 999 returns a mismatch.
CVV result codes
The card networks return one letter for the code check. Visa publishes these values:
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- M: match
- N: no match
- P: not processed
- U: unknown, issuer does not support the check
- S: code not on the card
AVS is a separate check on the street address and ZIP code. A transaction can pass one check and fail the other.
Storage rules
PCI DSS Requirement 3.2 forbids storing the CVV, full track data, or PIN block after authorization. A merchant that keeps the code in a database fails the rule even when the data is encrypted. A sandbox holds no live account data, so the rule does not apply there.
Limits of simulation
A sandbox cannot copy issuer fraud scoring, 3-D Secure step-up, or network latency. Some gateways skip the code check in test mode and return M for every value. Read the gateway documentation before you trust a result. A passed test says the code path works. It says nothing about the approval rate on live traffic.