protected function prepareFields($options = [])
    {
        $params = $this->toArray($options);

        if (empty($this->mapper)) {
            return $params;
        }

        foreach ($this->mapper as $modelKey => $apiKey) {
            if(array_key_exists($modelKey,$params)) {
                $params[$apiKey] = $params[$modelKey];
                unset($params[$modelKey]);
            }
        }

        return $params;
    }