Change API port to something different form 80

Hi there guys!
I want to add ssl to icecast2 (i did it on another server without libretime some time ago) but it requires icecast to be accessible on port “80”.
So i wonder, is it possible to change API port to another, not 80?
i tried to change it in airtime.conf - nothing changed.
also, it is mentioned in your docs that if you change base_url or base_port, you have to change it in api_client.cfg also.
but i can’t find this file in /etc/airtime