Thanks Jesse. I was making difficult and it can't be easier.
Got it. Thanks again sjau.
Thanks sjau. But do you mean that's the only aspect to care about for my question? Did I well understood the use of --webroot-path and paths?...
For the ISPConfig Interface I did this and it works certbot auth --text --agree-tos --update-registration --authenticator webroot --server...
Separate names with a comma.