cgi not found

Hello,
You may download the appropriate CGI at https://www1.paybox.com/telechargement_focus.aspx?cat=3.
And be sure that the local full path you have mentioned (/the/path/to/paybox.cgi) is “executable” : you can try to run the exe by pasting this local full path in a shell command window.
You may not use the paybox CGI as a CGI but as a local executable.
Best