// Пример использования нового API для авторизации по биометрии
class AuthenticationSampleActivity : FragmentActivity() {

    private val authResultLauncher = registerForAuthenticationResult(
        onAuthFailedCallback = {
            Log.i(TAG, "onAuthenticationFailed, try again")
        },

        resultCallback = { result: AuthenticationResult ->
            when(result) {
                is AuthenticationResult.Success -> result.authType
                is AuthenticationResult.Error -> result.errorCode
            }
        }
    )

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val authRequest: AuthenticationRequest =
            AuthenticationRequest.Biometric.Builder(...)
               // Setup build request
                .build()

        authResultLauncher.launch(authRequest)
    }
}

val securePrefs by SecurePrefs(context)
securePrefs.put("user_token", token)
val token = securePrefs.get(
   key = "user_token",
   default = null,
)

securePrefs
    .keyResult("user_token", "")
    .collect { token ->
         println("Current token: $token")
     }