Thanks You for the Info:
Maybe it’s better to use existing billing system and only write some custom rules to communicate with zeroshell router? Backend scripts are located at folder /root/kerbynet.cgi/scripts/.
To confess, I do not know anything about Programming or Scripting so I will be actively logging to information or someone that can assist. But what program can I run in a website that will communicate with the /root/kerbynet.cgi/scripts/.
Example: Java, C++, Bash, Perl, PHP….
If I know what is best then I would know who to look for, for help.