When using an external keyboard to enter membership cardholder information at POS, the Tab key will select the next field to the right, rather than down to the next logical field.
Due to the nature of iOS, the Enter/Return key on an external keypad works the same as "Next" on the virtual keypad, tabbing through the fields in the following (preferred) order:
Name on Card
Address line 1
Address line 2
As such, it is recommended to train staff to use the Enter/Return key when they want to tab.