You can use any transactional card to register on the app. It can be a debit, cheque or credit card that has an ATM pin.
If you have all three cards, register with your primary card (the one that has all your other accounts linked to it, as well as your beneficiaries or recipients). This would also be the one you use to access Internet Banking, if you use that service currently.
If you don’t use Internet Banking, then link the card number of the card that you use at the ATM. The accounts that are available to you on Internet Banking, or at the ATM, will all appear within the app