Code - Definition

M -- CVV2 Match
N -- CVV2 No Match
P -- Not Processed
S -- Issuer indicates that CVV2 data should be present on the card, but the Merchant has indicated data is not present on the card
U -- Issuer has not certified for CVV2 or Issuer has not provided Visa with the CVV2 encryption keys
Empty - Transaction failed because the wrong CVV2 number was entered or no CVV2 number was entered
X -- No response

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