code: public function securityAuthenticate()
      {
          $msgName = 'Security_Authenticate';
  
          return $this->callMessage(
              $msgName,
              new RequestOptions\SecurityAuthenticateOptions(
                  $this->authParams
              ),
              [],
              false
          );
      }
docs: Authenticate.
  
  Authentication Parameters were provided at construction time (authParams)
  
  @return Result
  @throws Exception