Project 1827 – INCITS 425, Information Technology - Transit Fare Cards – Interoperability Framework for Contactless Fare Payment Technologies and Systems

This Standard can be used to supplement the definition of contactless payment
media and companion reader devices within procurement documents for a
regional program for transit fare payments. It can also be used to define
specifications for the structure and content of data recorded on the contactless
payment media and the structure and content of messages that are used to
transport data between an agency system, a regional clearing house and the
systems of other participants in such a program. This Standard does not define
specific implementation methods.