iss_create_client.cs

// SecurityMode.Transport enables HTTPS
var binding = new WSHttpBinding(SecurityMode.Transport)
{
  Security = 
  {
    Mode = SecurityMode.Transport,
    Message = {ClientCredentialType = MessageCredentialType.None},
    Transport = 
    {
      ClientCredentialType = HttpClientCredentialType.InheritedFromHost,
      ProxyCredentialType = HttpProxyCredentialTYpe.None,
      Realm = string.Empty
    }
  }
};

// Enable authentication
var passageServiceClient = new PassageServiceClient(
  binding,
  new EndpointAddress("https://[SYNERGY URL]/PassageService")
);

// Add credentials
passageServiceClient.ClientCredentials.UserName = "[USERNAME]";
passageServiceClient.ClientCredentials.Password = "[PASSWORD]";