public static function apiXls()
 {
     $results = self::paymentsPerPayee(Auth::user()["code"])->select(self::downloadHeader())->get()->toArray();
     return ["content" => CsvFileService::toXls($results, implode("\t", self::downloadHeader())), "content_type" => "application/vnd.ms-excel", "filename" => "payments.xls"];
 }