Instead of inserting a debit card, you hold your phone up to the ATM machine and it withdraws money using Apple Pay or Google Wallet or service where you have your ATM card details registered.
At the convenience stores would even be well, convenient.
Once having installed Taiwan Mobile Payment and added supported ATM cards, financial service users would do cash withdrawal at designated ATMs supporting contactless payment/QR code scanning without ATM cards. Financial Information Service Co., Ltd - Index
ATM Cardless Withdrawal
Once having registered the cardless withdrawal service and obtained the passwords, financial service users could withdrawal at ATMs through the cardless withdrawal serial numbers generating from users mobile banking applications. Financial Information Service Co., Ltd - Index