Renaming Virtual Server https://whmcs.foo.com to https://billing.foo.com

If i was intending to make a change to my existing whmcs installation from https://whmcs.foo.com to https://billing.foo.com or perhaps https://foo.com using "virtualmin>Server configuration>change domain name" are there any special considerations i need to keep in mind? (I see there is a "move virtual server" option as well?)

Installed is

whmcs (obviously)

Letsencrypt SSL certificate

mail.whmcs.foo.com (will change to parent domain mail.foo.com)

ftp.whmcs.foo.com (will change to parent domains ftp.foo.com)

I am also using sendgrid mail relayhost (not sure if this is relevant or not)