90.8 Configuring the Authentication Callbacks
When the biometric prompt dialog is configured, it will need to be assigned a set of authentication callback methods that can be called to notify the app of the success or failure of the authentication process. These methods need to be wrapped in a BiometricPrompt.AuthenticationCallback class instance. Remaining in the MainActivity.kt file, add a method to create and return an instance of this class with the appropriate methods implemented:
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import android.hardware.biometrics.BiometricPrompt
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private val authenticationCallback: BiometricPrompt.AuthenticationCallback
get() = object : BiometricPrompt.AuthenticationCallback() {
override fun onAuthenticationError(errorCode: Int,
...
