Would you like to auction off someone else's movable property, property or rights on a commercial basis? You will need a permit to do so. You can find out more here.
If you would like to be publicly appointed and sworn in as an expert, you can apply to the chamber responsible for you (e.g. IHK, HwK, Chamber of Agriculture, Chamber of Engineers, Chamber of Architects).
Language mediators can - if certain personal and professional requirements are met - be sworn in generally for work in courts and authorities. For interpreting work in the courts, the requirements that lead to the swearing-in are based on the Federal ...