Abstract: A method comprising, sending a request from a requester to a provider via a bus, the request including a provider description and an identity token of a first type, wherein the bus includes an identity service mediation node having data associating a plurality of providers descriptions with corresponding identity token types, determining with the identity service node an identity token type associated with the provider description, updating the request with data including the identity token type associated with the provider description, sending the updated request with data including the identity token type associated with the provider description to an identity service via the bus, transforming the identity token of the first type into an identity token of the type associated with the provider description with the identity service, and sending the request including the transformed identity token to the provider via the bus.