public override void ProcessSignInRequest(Scope scope, HttpContextBase httpContext)
{
Logger.Debug(string.Format("ProcessSignInRequest, Issuer.Url {0}, ReplyUrl {1}", Issuer.Url, MultiProtocolIssuer.ReplyUrl));
var client = new OpenIdClient(Issuer.Url,MultiProtocolIssuer.Identifier);
client.RequestAuthentication(httpContext, MultiProtocolIssuer.ReplyUrl);
}