Hi,
I've managed to make boxbilling work with Plesk from gihub script for "Plesk for Boxbilling":
https://github.com/boxbilling/boxbilling/blob/5af4cc20d984022ab812494b0a0f10887a0d42f5/src/bb-library/Server/Manager/Plesk.php
Somehow somewhere there is an "mistake": My client order package, it...