Can I use an already issued SSL with your cPanel plugin?
It is possible to use a previously issued SSL with the cPanel plugin. In order to do this, you will need to reissue the certificate from within our plugin. This will create a new RSA Private key on the server, as the original one cannot be recognized by the plugin.
You can refer here for reissuance instructions.
After the reissue is complete, the certificate will be installed on the server.