I was under the impression that it is pretty much impossible to infringe airspace while flying IFR under ATC (and complying).
Can you tell us what kind of flight it was? Below FL100? Departure/Arrival in Germany?
I assume that you do not hold a german issued license. In this case I would not worry about the license. Do some research if fines by this Banana Republic Deutschland can generally be drawn-in in your home country. Maybe your flavour of AAA is a good starting point.
For "simple" infingements, I have heard from as little as €250 up to €4000. If you take it to court, the problem is that it is that always the same court with the "Amtsgericht Langen" is responsible (because the "Bundesaufsichtsamt für Flugsicherung" (Federal agency for supervision of air traffic control) are residing in this hessian provincial town). The court and the guys from the "Bundesaufsichtsamt für Flugsicherung" know each other by first name, that says something on what to expect from a trial.
Last edited by BDAttitude; 23rd January 2021 at 15:11.