Czy istnieje próbka dostępu do interfejsu API usługi Google przy użyciu konta usługi w .net?

private const string SERVICE_ACCOUNT_EMAIL = "[email protected]";
private const string SERVICE_ACCOUNT_PKCS12_FILE_PATH = @"\path\test-privatekey.p12";

static DriveService BuildService() 
{
    X509Certificate2 certificate = new X509Certificate2(SERVICE_ACCOUNT_PKCS12_FILE_PATH, "notasecret",
    X509KeyStorageFlags.Exportable);

    var provider = new AssertionFlowClient(GoogleAuthenticationServer.Description, certificate)
    {
        ServiceAccountId = SERVICE_ACCOUNT_EMAIL,
        Scope = DriveService.Scopes.Drive.GetStringValue(),
    };
    var auth = new OAuth2Authenticator<AssertionFlowClient>(provider, AssertionFlowClient.GetState);

    return new DriveService((new BaseClientService.Initializer()
    {
        Authenticator = auth
    });
}

Nie jest to skuteczne w zwracaniu połączenia OAuth. Jak można to zrobić?