Kasse/api/csv.php

<?php
require_once (dirname(__FILE__)."/controllers/RequestController.php");

$req = new RequestController();
$data = json_decode(file_get_contents('php://input'), true);

header('Cache-Control: no-cache, must-revalidate');
header('Content-type: text/csv; charset=utf-8');
header('Content-disposition: attachment;filename=Abrechnung.csv');
echo $req->CsvExport($data);