I'm going to be in Germany for a year and getting a BahnCard is a no-brainer. I was about to purchase it online, when someone advised me that I'd later need to show the credit/debit card I use as proof of ID on the train.
The problem is that I use a debit card that is not in my name, but rather in my sister's name because I was not old enough to open up my own bank account. All the money in there is mine (I am not committing fraud lol), it's just that the account is in her name.
What can I do in this case? If I pay with PayPal, would that help at all? What exactly does Deutsche Bahn do in cases such as this (or parents buying their minors an online BahnCard with their cards)?