Hello,
In my suggestion, the csv file generated within the web hooks script which I will write for you by using PHP script as well. This PHP script will use the API for retrieving the order detail and store on csv file on the server. I will be able to solve this script and the web hook settings over weekend, so you will have it ready on Sunday evening, in case you need it in hurry.
Let me know if you OK with my offer.
Best Regards,
Khamid