This document defines an application interface definition by selecting suitable options from the base standard EN ISO 12855:2021. Furthermore, it defines transfer mechanisms and supporting functions to ensure the interoperability between Toll Chargers and Toll Service Providers. This document covers: — exchange of information between the central equipment associated with the two roles service provision and toll charging, e.g.: o charging related data (exception lists, toll declarations, billing details, payment claims); o administrative data (trust objects, EFC context data, contact details for enforcement, etc.); o confirmation data. — transfer mechanisms and supporting functions; — semantics of data elements; — restrictions on parameters and their values — implementation conformance statement proforma, in an Annex, as a basis for assessment of conformity to this document; — an Interoperability statement proforma, in an Annex, as a basis for assessment of transactional interoperability of two technical implementations; — a web service definition, in an Annex, for the use of web services as communication technology. The implementation of the underlying back office systems and their business processes is not covered.