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.