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    ISO Response Codes


    The table below shows the overview of ISO response codes.

    Error CodeResponse Message
    100Do not honour
    101Expired card or invalid expiration date
    102Suspected fraud
    104Restricted card
    106Allowable PIN tries exceeded
    109Invalid merchant
    110Invalid amount
    111Invalid card number

    We do not recommend to provide the details to the cardholder, in that providing the reason for a denial means providing ill-intentioned persons with an instrument to commit fraud.

    We suggest distinguishing between positive and negative outcome alone and, possibly, advising the cardholder to repeat the transaction carefully checking entered details or contacting his/her bank immediately.

    The complete list of ISO error codes is available upon request.

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