To be employed as a professional driver, you will need an initial qualification as well as regular training. How are the relevant proofs documented?

Your answer is correct. As a professional driver in Germany, you need both an initial qualification and ongoing periodic training. The evidence for this is documented on two places: your driver qualification card and in the professional driver qualification register managed by the Federal Motor Vehicle and Transport Authority (KBA). These proofs ensure that only properly qualified and regularly trained drivers work in professional transport, supporting road safety and compliance with EU regulations. The qualification is not simply listed online by your local licensing agency, so that option would not be correct. This knowledge helps you understand how professional driver training compliance is monitored and proven in Germany.