Can I issue a wildcard SSL for free?
This is available only with the Let's Encrypt SSL plugin.
If you use the Let’s Encrypt plugin to issue certificates for wildcard domains, be aware that:
This plugin cannot use HTTP DCV challenges to issue certificates for wildcard domains. This is because Let’s Encrypt does not support this type of challenge. For more information, read Let’s Encrypt’s HTTP-01 challenge type documentation.
You cannot use this plugin to obtain certificates for wildcard domains if you use third-party DNS hosting. You must host DNS on your local cPanel & WHM server or within the server’s DNS cluster.