Small DynDNS Script (which works with Plesk Onyx)
German Install Guide: https://www.weyand.biz/2017/07/12/dyndns-mit-plesk-ipv4-ipv6-und-php7-224.html
Deutsche Installations Anleitung: https://www.weyand.biz/2017/07/12/dyndns-mit-plesk-ipv4-ipv6-und-php7-224.html