@interface NGMMessageFormatter : NSObject + (id)formatOutgoingInnerMessageWithPayload:(id)a0 attributes:(id)a1 destinationIdentity:(id)a2 sendingIdentity:(id)a3 error:(id *)a4; + (id)formatOutgoingMessageWithEncryptedPayload:(id)a0 ephemeral:(id)a1 signature:(id)a2 keyValidator:(id)a3; @end