We Germans are bipolar maniacs on almost every possible occasion 😅 (e.g. renewables)

No seriously: the majority of Germans (especially older people) are extremely skeptical of credit cards and digital payment systems like Apple/Google Pay  - 
Cash is very important and highly valued, still. Before the pandemic it was sometimes the only option to pay at small merchants and markets.
Usually you would expect card payments only available above a threshold of 10€ total. 🤯