SENDER_ID not actually used anywhere in the package

[makowskid]

    public function withDefaultConfiguration()
    {
        $appSid = config('services.unifonic.app_id');
        $email = config('services.unifonic.account_email');
        $password = config('services.unifonic.account_password');

this is the only place anything is loaded from the config
SENDER_ID is simply ignored

Can you add support for it?