ISO/TS 21193:2019 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.