Hello, anybody working on German/EU electronic invoicing XML standard Zuferd?

Did you mean ZUGFeRD? I've not heard of it before now, but as a general rule I generally look to the Java community for solutions when it comes to stuff like this. It's usually a lot easier to find Java libraries to help with integration. You might take a look at the Java projects that support ZUGFeRD: https://zugferd.org/materials/e-invoicing/1.0.0/index.html#_java

yes, exactly, I would prefer a native CF lib, but if there is not much feedback it’s probably not worth the effort

I'm interested, too. I'm pretty sure we need this next year also. And: This is not only a german thing, this is EU wide.

Afaik there are country specific implementations, France has Factur-X, all should implement EN16931 (what ever that means 😂)