The Magenta Pay app doesn't offer a direct option to pay credit cards from other banks. However, here are some alternative methods you can try:
a) Payment through the other bank's e-banking: If the other bank's e-banking platform allows you to enter your Magenta Pay card details, you can use that to complete the payment.
b) Another option is to transfer funds to your account with the other bank and then use that account to pay off your credit card.