1. A computer program product embodied on a non-transitory computer readable medium for facilitating communication, comprising: at least one database containing policy data for a plurality of entities stored therein; computer code for controlling at least one computer device and operable to receive a posted message, wherein a token is included in a header of the posted message; wherein the computer program product is operable such that each of the plurality of entities contains policy data corresponding thereto for governing interaction with the entity utilizing an interoperability network; wherein the computer program product is operable such that policy data of a first entity and policy data of a second entity are used for authorization; and computer code for merging the policy data of the first entity and the policy data of the second entity to produce a combined policy that is honored by both entities.