namespace Microsoft.Azure.KeyVault
{
    public class KeyVaultClient : ServiceClient<KeyVaultClient>, IKeyVaultClient, IAzureClient, IDisposable
    {
        public delegate Task<string> AuthenticationCallback(string authority, string resource, string scope);
        {
            public virtual IAsyncResult BeginInvoke(string authority, string resource, string scope, AsyncCallback callback, object object);
        }
    }
}