This Technical Specification defines an application interface definition by selecting suitable options from the base standard EN ISO 12855:2015. Furthermore, it defines transfer mechanisms and supporting functions to ensure the interoperability between TCs and TSPs. This Technical Specification covers: — exchange of information between the central equipment associated with the two roles service provision and toll charging, e.g.: — charging related data (exception lists, toll declarations, billing details, payment claims); — administrative data (trust objects, EFC context data, contact details for enforcement, etc.); — confirmation data. — transfer mechanisms and supporting functions; — semantics of data elements; — implementation conformance statement proforma (Annex A), as a basis for assessment of conformity to this Technical Specification; — an Interoperability statement proforma (Annex B), as a basis for assessment of transactional intereoperability of two technical implementations; — a web service definition (Annex C) for the use of web services as communication technology.