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iDEAL and Bancontact are listen on the "Direct Debit" tab in the 4th step.
A KC11B04 analog AD 4x1 keypad only needs a single analog pin to readout 4 different buttons. The big advantage is that you save 3 pins, which you can now use for other components.
In this video I describe how to read the analog AD KC11B04 4x1 keypad and how this keypad uses resistors to split the different buttons. The keypad is called an AD-keypad since it has a single AD-pin (Analog Data).