VersionPress\Api\VersionPressApi::registerRestRoute PHP Method

    private function registerRestRoute($route, $args = [], $override = false)
    {
        $args['callback'] = $this->handleErrorOutput($args['callback']);
        if (!isset($args['permission_callback'])) {
            $args['permission_callback'] = [$this, 'checkPermissions'];
        }
        return register_rest_route(self::NAMESPACE_VP, $route, $args, $override);
    }