code: function (req, res, next) {
              if (options.decisionPage) {
                  var urlObj = {
                      pathname: options.decisionPage,
                      query: {
                          transactionId: req.oauth2.transactionID,
                          userId: req.oauth2.user.id,
                          clientId: req.oauth2.client.id,
                          scope: req.oauth2.req.scope,
                          redirectURI: req.oauth2.redirectURI
                      }
                  };
                  return res.redirect(url.format(urlObj));
              }
              res.render(options.decisionView || 'dialog',
                  {
                      transactionId: req.oauth2.transactionID,
                      user: req.user, client: req.oauth2.client,
                      scopes: req.oauth2.req.scope,
                      redirectURI: req.oauth2.redirectURI
                  });
          }
docs: Now try to render the dialog to approve client app's request for permissions