code: public MessageResponse sendFlashMessage(final String originator, final String body, final List<BigInteger> recipients) throws UnauthorizedException, GeneralException {
          final Message message = new Message(originator, body, recipients);
          message.setType(MsgType.flash);
          return messageBirdService.sendPayLoad(MESSAGESPATH, message, MessageResponse.class);
      }
docs: Convenient function to send a simple flash message to a list of recipients
  
  @param originator Originator of the message, this will get truncated to 11 chars
  @param body       Body of the message
  @param recipients List of recipients
  @return MessageResponse
  @throws UnauthorizedException if client is unauthorized
  @throws GeneralException      general exception