DS CWA 16374-65:2012 Extensions For Financial Services (Xfs) Interface Specification Release 3.20 - Part 65: Pin Keypad Device Class Interface Migration From Version 3.10 (Cwa 15748) To Version 3.20 (This Cwa) Programmer's Reference Explains the application program interface for personal identification number keypads (PIN pads) and other encryption/decryption devices.