Currently paid SSL certificates can be manually uploaded, but their valid time will be reduced to 100 days, then in 2029 to 47 days.

It would be great to have an option where the user can supply vendor data, keys then certbot/acme.sh would automatically validate domains, then deploy and manage the certs.

Also the panel only support Let's Encrypt certificates automatically, but there are more that can be used like GTS or ZeroSSL. Are you planning to add them?