Whichever CDN you use, you must point to that subdomain to the Stape IP listed in your container.

You can take general concepts from the Cloudflare example.

If you don’t know how to use Own CDN on Stape, we have a detailed article.

Stape validates the domain and passes through the hits; everything else is to be done on the CDN provider's side.

We can’t cover all of the specific CDN providers out there (in terms of instructions), but you shouldn’t have any limitations on using KeyCDN.