Support for Authentication plugin usage.
Instead of the core Auth component you load the Authentication component:
$this->loadComponent('TinyAuth.Authentication', [
...
]);
Make sure you load the middleware:
use Authentication\Middleware\AuthenticationMiddleware;
// in Application::middleware()
$middlewareQueue->add(new AuthenticationMiddleware($this));
For all the rest just follow the plugin's documentation.
Then you use the Authentication documentation to fill your INI config file.