Can it work without permalinks?

I would like to use this url
Referrer url : http(s)://yourdomain.gr/?page_id=6
instead of
Referrer url : http(s)://yourdomain.gr/checkout

Because after I switched from Apache to nginx, I still cannot get those permalinks to work (so my actual checkout page is the first one above). I read in another topic (mpbm23 wrote): “you must have pretty url enabled”. Can this be circumvented? I looked at your php file and found the call $woocommerce->cart->get_checkout_url(). Will it not work with my setup?