Auth0\JWTAuthBundle\DependencyInjection\Configuration::getConfigTreeBuilder PHP Method

    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('jwt_auth');
        $rootNode->children()->scalarNode('client_id')->isRequired()->cannotBeEmpty()->end()->scalarNode('client_secret')->isRequired()->cannotBeEmpty()->end()->scalarNode('domain')->defaultValue('')->end();
        return $treeBuilder;
    }