MESSAGING_CONVERSATION_POSSIBLE_PARTICIPANT_SEARCH MESSAGING Endpoint
  /rpc/messaging/?method=MESSAGING_CONVERSATION_POSSIBLE_PARTICIPANT_SEARCH  
  For information on how to use Advanced Searches, click here  
  Lets you search for users across spaces to add to a conversation  
  DETAILS    
  Prefix PossibleParticipant  
  AVAILABLE FIELDS TYPE  
  FirstName Text (100)  
  MyDigitalSpaceId Numeric Alias of User
  Surname Text (100)  
  TradeName Text (100)  
  User Numeric  
  RETURN  
  Selected Fields