Hi,
I hope this is the correct way to submit this patch.
https://www.domaindiscount24.com/ has its own ddns service runnning, which (for me) gets rid of the necessity of having to use an extra service for that.
I tested the following patch on my system at home, and attached it to this mail.
I started my quest at the community forum: https://community.ipfire.org/t/adding-new-ddns-provider/428/2
Christof