Standing at the fuel station with a book to collect receipts, I do wonder after him telling he needs to pay six digest back to The Office, the only one that truly matters among TheGermans, why he payed in cash and not used his bank card or dedicated credit card...
Fore all others, a standard wallet has two parts for bills. One is the legal, the other about 10% of that and you buy only small stuff from all of that. Ice Cream and Softdrinks on a hot skater day. Going bigger means here having to become one of US or give tribute to the Peaky Blinders ... if you can cope log term with the locals on even small business terms.
They are like hell annoying.