Function 040 is used when a cardholder performs a transaction with an invalid PIN and repeats until the PIN is locked. A counter keeps track of those BAD pin attempts. After a certain number of tries are exceeded, the cardholder account is locked out. Unlock bad pin tries API function sets the bad pin tries counter to zero.
|P1||PAN or ALT ID||Y||(16,19) numeric|
dassignedtome&FUNC=040&MSGID=00001704406600030&P1=PAN or ALT ID