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Mastercard / ISO 8583 response code

Decline code 63: security violation

Hard decline (do not retry)

What decline code 63 means

The transaction failed a security check at the issuer, such as a CVC or cryptogram mismatch, or the card has been flagged.

Should you retry?

Do not machine-retry. If the customer is present, ask them to re-enter their details.

Retrying hard declines costs money. Visa limits reattempts on a card to 15 in 30 days, and Mastercard charges for attempts beyond its thresholds and for every retry after a Merchant Advice Code 03 or 21. Route this decline to account updater or customer outreach instead. See soft vs hard declines.

Equivalent codes

  • Stripe decline code: security_violation

Frequently asked questions

Is decline code 63 a soft or hard decline?

Hard decline (do not retry). The transaction failed a security check at the issuer, such as a CVC or cryptogram mismatch, or the card has been flagged.

Should I retry a payment that failed with decline code 63?

Do not machine-retry. If the customer is present, ask them to re-enter their details.

Other response codes

Reference information for merchants. Network rules and fee schedules change; confirm current figures with your acquirer. Mastercard is a registered trademark of Mastercard International Incorporated, which does not sponsor or endorse this service.