I would love to use the LexOffice-API easily.
First of all, I would like to sync contacts, for instance to the newsletter tool or to any other CRM.
Secondly, I would love to create bills via the API.
It has a business case.
https://developers.lexoffice.io/docs/#lexoffice-api-documentation
I am willing but probably not able.
Welcome to the community @sascha.foerster
The API looks very well documented. In the meantime, you can use the HTTP node. Did you try that?
https://developers.lexoffice.io/docs/#lexoffice-api-documentation-introduction
Not yet, as I am starter. But I see the potentials! 
I’d really love a Lexoffice integration and I would love to help creating that. I’ve already implemented the Lexoffice API multiple times on Web Projects so i’m familiar with it.
Oh my good! The endless possibilities to create bills, manage contacts and automate your business! 
@flfeders You will make me very happy! I am not good in programming, but I love testing, can help documenting and most of all using!
I’ve started working on a Lexoffice API node, feel free to test it out (it’s not quite finished yet…). In particular, most POST requests still only have Json Body fields.