Large scale banks like Bank of America, Chase made a connection with Apple Pay. But, banks in several countries were not worked with Apple Pay directly; they integrated with Apple Touch ID, St George Bank(Australia), Tangerine(Canada), Turkiye Bankasi(Turkey).
They only added the function, authenticated by fingerprint via Touch ID. So, customers can login into mobile banking with their fingerprint instead of the traditional identification, password and PIN.
Banks can develop the fingerprint authentication using Apple’s API. And the biometric data is stored into the customer’s device.