I want a way of allowing users to access a whit-label version of my WebApp using a CNAME record allowing them to login to their app from a subdomain or domain they setup.
e.g. app.mywebapp.com would be where I host the app.
User will access app via userapp.userdomain.com or userdomain.com by using a cname record pointing to app.mywebapp.com.
How do I achieve this?