I have multiple websites on non-standard http ports or not publicly accessible using my own domain for which I run my own nameservers. All with several ISPConfig servers. ISPConfig's default certbot with webroot validation is giving me no joy if I want to enroll certificates for those websites. But Acme.sh has the ability to validate using the ispconfig dns api. That's why on one of my webservers I substituted certbot by acme.sh. Enrolling certificates still work. Big question is: how can I get ISPConfig to use the ispconfig dns api instead of webroot? This also would be a nice feature in future versions of ISPConfig. Giving ISPConfig users the ability to set the validation method in Server Configuration for example. And then maybe not only ISPConfig dns API but also a bunch of other dns API's supported by Acme.sh.