ISO Response Codes
The table below shows the overview of ISO response codes.
|Do not honour
|Expired card or invalid expiration date
|Allowable PIN tries exceeded
|Invalid 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.