biometrics_authentication_callback.kt

val authenticationCallback = object : BiometricPrompt.AuthenticationCallback() {
    override fun onAuthenticationSucceeded(result: BiometricPrompt.AuthenticationResult) {
        // Authentication succeeded
    }

    override fun onAuthenticationError(errorCode: Int, errString: CharSequence) {
        // Authentication errored out. Verify error code and message
    }

    override fun onAuthenticationFailed() {
        // Authentication failed. User may not have been recognized
    }
}