Security Violation
What it means
The transaction was declined because of a security violation, and the card may be restricted.
Why it happens
The issuer detected a security rule breach, which can indicate the card has been restricted or flagged.
If you’re the cardholder
Contact your issuer to resolve the security block, or use another card.
If you’re the merchant
Do not retry; treat as a security-related decline and offer an alternative method.