Console Application to retrieve Domain Shared Contacts (Google Apps Admin SDK)

    public static Feed<Contact> MakeRequest(string userId, int numberToRetrieve = 9999)
    {
        var serviceCredential = new ServiceAccountCredential(new ServiceAccountCredential.Initializer(ServiceEmail)
        {
            Scopes = new[] { @"https://www.google.com/m8/feeds/" },
            User = userId,
        }.FromCertificate(Certificate));

        var reqAccessTokenInfo = serviceCredential.GetType()
          .GetMethod("RequestAccessToken", BindingFlags.Instance | BindingFlags.NonPublic);
        var task = (Task<bool>) reqAccessTokenInfo.Invoke(serviceCredential, parameters: new object[] {new CancellationToken()});
        task.Wait();

        var settings = new RequestSettings(Properties.Settings.Default.ApplicationName, serviceCredential.Token.AccessToken);
        var cRequest = new ContactsRequest(settings);
        var query = new ContactsQuery(ContactsQuery.CreateContactsUri(userId)) { NumberToRetrieve = numberToRetrieve };

        return cRequest.Get<Contact>(query);
    }