Question regarding a client that requires both a Basic Authentication UserName credential and another WS-Security UserName credential

[Rans4ckeR]

We have a setup where a wcf client connects to a mandatory gateway application using Basic Authentication. The request is then forwarded to a third party service which uses WS-Security. Both have 2 different username/password values.

Until now I was only able to make this work by configuring the client to use Basic Authentication and then to add the WS-Security header manually.

Is there a better way to achieve this in (.NET9) code?

I'm using a custom binding which contains the BindingElement created by:

SecurityBindingElement.CreateUserNameOverTransportBindingElement()

The client's Basic Authentication UserName credentials are then set like so:

var clientCredentials = (ClientCredentials)client.Endpoint.EndpointBehaviors[typeof(ClientCredentials)];

clientCredentials.UserName.UserName = username;
clientCredentials.UserName.Password = password;

But then I'm stuck with setting the WS-Security UserName credentials (except when manually adding the header).

Is there a way to specify 2 different UserName credentials? One for Basic Authentication and one for WS-Security?