public string ToJson()
{
var encoder = new JsonEncoder(ServiceMessageContext.GlobalContext, true);
encoder.WriteString("authority", AuthorityUrl);
encoder.WriteString("grantType", GrantType);
encoder.WriteString("tokenEndpoint", TokenEndpoint);
encoder.WriteString("resource", ResourceId);
encoder.WriteStringArray("scopes", Scopes);
return(encoder.Close());
}