ISO/DTS 21193

This document defines requirements to support information exchanges among related entities of a common payment scheme. It defines: a) electronic fee collection (EFC) 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 are 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.