Schufa is a German credit rating agency. By law it is required to provide information to consumers (while it makes all its money, for now, off corporate customers). As a consequence, its password and login screens have been designed, I suggest, to be as unusable as possible. Below please find a screen-shot of the PIN setting dialog, (The pin is the second of two passwords you need to login.) There are plenty of requirements. My favorite requirement is “use at least one special character but don’t use any illegal special characters”. Also, kind of amusing, the admonishment “to think really hard to remember your PIN”.