$keycloak = new \Fschmtt\Keycloak\Keycloak(
    baseUrl: 'http://keycloak:8080',
    username: 'admin',
    password: 'admin'
);

$serverInfo = $keycloak->serverInfo()->get();

echo sprintf(
    'Keycloak %s is running on %s/%s (%s) with %s/%s since %s and is currently using %s of %s (%s %%) memory.',
    $serverInfo->getSystemInfo()->getVersion(),
    $serverInfo->getSystemInfo()->getOsName(),
    $serverInfo->getSystemInfo()->getOsVersion(),
    $serverInfo->getSystemInfo()->getOsArchitecture(),
    $serverInfo->getSystemInfo()->getJavaVm(),
    $serverInfo->getSystemInfo()->getJavaVersion(),
    $serverInfo->getSystemInfo()->getUptime(),
    $serverInfo->getMemoryInfo()->getUsedFormated(),
    $serverInfo->getMemoryInfo()->getTotalFormated(),
    100 - $serverInfo->getMemoryInfo()->getFreePercentage(),
);

class MyCustomRepresentation extends \Fschmtt\Keycloak\Representation\Representation
{
    public function __construct(
        protected ?string $id = null,
        protected ?string $name = null,
    ) {
    }
}

class MyCustomResource extends \Fschmtt\Keycloak\Resource\Resource
{
    public function myCustomEndpoint(): MyCustomRepresentation
    {
        return $this->queryExecutor->executeQuery(
            new \Fschmtt\Keycloak\Http\Query(
                '/my-custom-endpoint',
                MyCustomRepresentation::class,
            )
        );
    }
}

$keycloak = new Keycloak(
    $_SERVER['KEYCLOAK_BASE_URL'] ?? 'http://keycloak:8080',
    'admin',
    'admin',
);

$myCustomResource = $keycloak->resource(MyCustomResource::class);
$myCustomRepresentation = $myCustomResource->myCustomEndpoint();