code: public function addOauthClient($user_id, $oauth_client_create_item)
      {
          list($response) = $this->addOauthClientWithHttpInfo($user_id, $oauth_client_create_item);
          return $response;
      }
docs: Operation addOauthClient
  
  
  
  @param string $user_id ID of the user related to the Oauth client (required)
  @param \ProcessMaker\PMIO\Model\OauthClientCreateItem $oauth_client_create_item JSON API with the Oauth Client object to add (required)
  @return \ProcessMaker\PMIO\Model\OauthClientItem
  @throws \ProcessMaker\PMIO\ApiException on non-2xx response