I used the #btx for online banking. Since that time never went to a bank for transfering money anymore.
Sure, BTX (later called Datex-J) is since a long time no more available. But in 1995 it was secure and reliable.

Just found that in the cellar.

1995 #btx and #internet was the hot shit.
This is from the advertisement for my first private internet provider #T-Online - in fact #DTAG (Deutsche Telekom).
I bought the 14400 Modem offered there