protected function installEnvironmentVariables()
    {
        $env = file_get_contents(base_path('.env'));

        if (str_contains($env, 'AUTHY_KEY=')) {
            return;
        }

        (new Filesystem)->append(
            base_path('.env'),
            PHP_EOL.'AUTHY_KEY='.PHP_EOL.PHP_EOL.
            'STRIPE_KEY='.PHP_EOL.
            'STRIPE_SECRET='.PHP_EOL
        );
    }