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First Data  Account Updater Response Codes:



Transaction Responses   
Code Message CSI Pay Code
CONTAC No Update CC
NOMTCH Not Matches NN
UPDATE OK UA
EXPIRY OK UE
NOUPDT No Update UN
XX Default or no response received. XX
**12NS Invalid Expiration Date XX
**05NS Bad card type code XX
**11NS Non-numeric account number XX
**19NS Merchant not registered XX
**04NS Invalid account number length XX
**06NS Bad check digit value XX