code: public Conversation startConversation(ConversationStartRequest request)
              throws UnauthorizedException, GeneralException {
          String url = String.format("%s%s/start", CONVERSATIONS_BASE_URL, CONVERSATION_PATH);
          return messageBirdService.sendPayLoad(url, request, Conversation.class);
      }
docs: Starts a conversation by sending an initial message.
  
  @param request Data for this request.
  @return The created Conversation.