The service extracts the customer-entered PIN from the input PIN
block according to the following rules:
- This service supports the specification of a PIN extraction method
for the 3624 and 3621 PIN block formats through the use of the rule_array
keyword. Rule_array points to an array of one or two
8-byte elements. The first element in the rule array specifies the
PIN calculation method. The second element in the rule array (if specified)
indicates the PIN extraction method. Refer to the Clear PIN Generate Alternate (CSNBCPA and CSNECPA) for
an explanation of PIN extraction method keywords.