This document defines requirements to support information exchanges among related entities of a common payment scheme. It defines:
a) EFC-related functional requirements for a common payment medium;
b) an application structure in a common payment medium;
c) EFC application data in a common payment medium.

The following is outside the scope of this document:
— requirements and data definitions for any other transport services such as public transport;
— a complete risk assessment for an EFC system using a common payment medium;
— security issues arising from an EFC application among all transport services;
— the technical trust relationship between a CSRP and a service user;
— concrete implementation specifications for implementation of security for an EFC system;
— detailed specifications required for privacy-friendly EFC implementations;
— any financial transactions of the CSRP.