Abstract: In certain embodiments, a method includes receiving from a validation system a request to apply a first policy service to a message. The validation system determines whether the message may be transmitted to a second network by validating a plurality of tokens associated with the message. The method includes receiving at least one result from a policy service engine of applying the first policy service to the message and determining at least one predefined assertion based on the received at least one result. The message includes generating a first token by encrypting the at least one predefined assertion using a first parameter associated with the first service node and not the second service node. The method includes sending the message and the first token to the validation system.