The return code specifies the general result of the callable service. Appendix A. ICSF and TSS Return and Reason Codes lists the return codes.

The reason code specifies the result of the callable service that is returned to the application program. Each return code has different reason codes assigned to it that indicates specific processing problems. Appendix A. ICSF and TSS Return and Reason Codes lists the reason codes.

The length of the data that is passed to the installation exit. The length can be from X'00000000' to X'7FFFFFFF' (2 gigabytes). The data is identified in the exit_data parameter.

The data that is passed to the installation exit.

The number of keywords you are supplying in the rule_array parameter. The parameter rule_array_count must be 0, 1, or 2.

Keywords that provide control information to the callable service. Each keyword is left-justified in 8-byte fields, and padded on the right with blanks. All keywords must be in contiguous storage.

The PAN_data parameter specifies an address that points to the place in application data storage that contains personal account number (PAN) information in character form. The PAN is the account number as defined for the track-2 magnetic-stripe standards.

• If the PAN-13 keyword is specified in the rule array, 13 characters are processed.
• If the PAN-14 keyword is specified in the rule array, 14 characters are processed.
• If the PAN-15 keyword is specified in the rule array, 15 characters are processed.
• If the PAN-16 keyword is specified in the rule array, 16 characters are processed.
• If the PAN-17 keyword is specified in the rule array, 17 characters are processed.
• If the PAN-18 keyword is specified in the rule array, 18 characters are processed.
• If the PAN-19 keyword is specified in the rule array, 19 characters are processed.

Even if you specify the PAN-13, PAN-14 or PAN-15 keywords, the server might copy 16 bytes to a work area. Therefore ensure that the callable service can address 16 bytes of storage.

The expiration_date parameter specifies an address that points to the place in application data storage that contains the card expiration date in numeric character form in a 4-byte field. The application programmer must determine whether the CVV will be calculated with the date form of YYMM or MMYY.

The service_code parameter specifies an address that points to the place in application data storage that contains the service code in numeric character form in a 3-byte field. The service code is the number that the track-2 magnetic-stripe standards define. The service code of '000' is supported.

A 64-byte string that is the internal key token containing a single- or double-length DATA or MAC key or the label of a CKDS record containing a single- or double-length DATA or MAC key.

When this key is a double-length key, CVV_key_B_identifier must be 64 byte of binary zero. When a double-length MAC key is used, the CV bits 0-3 must indicate a CVVKEY-A key (0010).

A single-length key contains the key-A key that encrypts information in the CVV process. The left half of a double-length key contains the key-A key that encrypts information in the CVV process and the right half contains the key-B key that decrypts information.

A 64-byte string that is the internal key token containing a single-length DATA or MAC key or the label of a CKDS record containing a single-length DATA or MAC key. When CVV_key_A_identifier a double-length key, this parameter must be 64 byte of binary zero. The key contains the key-B key that decrypts information in the CVV process.

The CVV_value parameter specifies an address that points to the place in application data storage that will be used to store the computed 5-byte character output value.