In which file should I put customized toast notification?

I want a custom message to pop in the "toast" little info window when an item is created.
However, I don't know where to put it, in which file. Again, this is something I struggle a lot with in Filament and I think this could be improved by providing perhaps more real world examples with real files with real names - just an idea.
Anyway, I have found this https://filamentphp.com/docs/3.x/actions/prebuilt-actions/create and
https://filamentphp.com/docs/3.x/actions/prebuilt-actions/create#customizing-the-save-notification but I don't know where to put this code:

CreateAction::make()
    ->successNotificationTitle('Bingo! User created!')


I am using the standard resource and it is happening in CreateUser.php? I am not sure.
Thanks for any advice where to put that code.
Solution
so the end result should look something like

class CreateUser extends CreateRecord
{
    protected static string $resource = UserResource::class;

    protected function getCreatedNotificationTitle() : ?string {
        return 'Bingo! User created';
    }
}
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