code: def get_startup_roles(self, user_id=None, startup_id=None, role=None, direction='incoming'):
      
  
      if user_id is None and startup_id is None:
        raise Exception("You need to provide at least one parameter")
      url = _STARTUP_R.format(c_api=_C_API_BEGINNING,
                                            api=_API_VERSION,
                                            at=self.access_token)
      if user_id is not None:
        url += '&user_id=' + str(user_id)
      if startup_id is not None:
        url += '&startup_id=' + str(startup_id)
      if role is not None:
        url += '&role=' + role
      url += '&direction' + direction
      return _get_request(url)
docs: user_id ->The user role you want to view
      startup_id -> The startup whose roles you want to view
      role -> The specific role, you'd like to filter ('founder', 'past investor', 'advisor')
      direction ->Either incoming or outgoing