public function csvExport(array $extraFields = [])
    {
        $url = '/players/csv_export?app_id='.$this->api->getConfig()->getApplicationId();

        $headers = [
            'Authorization' => 'Basic '.$this->api->getConfig()->getApplicationAuthKey(),
        ];

        $body = [
            'extra_fields' => $extraFields,
        ];

        return $this->api->request('POST', $url, $headers, json_encode($body));
    }