MyDebit's PayNet interface uses ISO 8583:1987, with a PayNet header, message types, bitmaps and data elements. Network-management and key-exchange messages complete this scheme-specific profile, defining the message format rather than assuming adoption of the newer ISO 8583 edition.
TL;DR:
- PayNet's MyDebit interface explicitly uses ISO 8583:1987.
- Messages comprise a PayNet header, message type, bitmaps and data elements.
- The documentation also describes network-management and cryptographic key exchange.
Summary
Named Message Baseline
The MyDebit documentation explicitly bases the PayNet ISO message on ISO 8583:1987. It describes a variable-length, variable-content interface configured for the message being exchanged. A newer ISO edition should therefore not be substituted for the profile actually documented.
Message Construction
A PayNet header, message-type indicator, bitmap and data elements organise the message. The bitmap identifies fields present in a particular exchange, so implementations need the documented field definitions as well as the general ISO message concept.
Network And Keys
The page includes network-management and key-exchange functions. It describes zone master keys protecting zone authentication and PIN keys, and distinguishes keys transported between members from the local master-key protection used inside the HSM.
Cryptographic Context
The published interface includes legacy 3DES mechanisms and TR-31 key-block information. These details identify the documented integration and are not a recommendation to adopt older mechanisms in a new system. Participant deployment and migration requirements need the operative PayNet instructions.
Keywords
- ISO 8583:1987
- Message Types
- Primary Bitmap
- Data Elements
- PayNet Header
- Network Management
- Key Exchange
- ZMK
- ZPK
- TCP Messages