connect custom domain with specific page,

connect custom domain with specific page, my app has a profile page for each restaurant like this ‘‘ https://orderingwebsite.io/orderonline?restaurantId=69118cee85393915f2f43a8a ‘‘ the restaurant owner will need to point their domain e.g www.myrestaurant.com to the page like this , and please dont say anything about domain forwarding etcetera , I want actual domain pointing with DNS. this is a very imprtant part of my App, without this there no point having my app in your platform, if you cant solve this I will need full refund of what I spend on building my app in a wrong platform