docs: def request_session(self):
          """
          Performs initial request to initialize session and get session id
          necessary to construct all future requests.
          :return: Session ID to be placed in header of all other requests.
          """
          concierge_request_header = self.construct_concierge_header(
              url="http://membersuite.com/contracts/IConciergeAPIService/WhoAmI")
  
          result = self.client.service.WhoAmI(
              _soapheaders=[concierge_request_header])
  
          self.session_id = get_session_id(result=result)
  
          if not self.session_id:
              raise MembersuiteLoginError(
                  result["body"]["WhoAmIResult"]["Errors"])
  
          return self.session_id