How does it Work?
When a custom domain is setup and and has traffic an SSL certificate will automatically be generated. You will be notified via email when assigning a domain in the editor and when the certificate is granted. Users will be able to remove the certificate from the SSL tab as well as restore.
Initially, auto SSL will is only available for sites created after November 25th. Eventually, auto SSL certificates will be created for existing sites as well.
Note: SSL certificates are not created for alternate domains.