how to use http service to post data to a url with client authentication

Hi, All,
Our partner enabled Client Authentication and we use http post to transfer data to their gateway . Pls advise what should be set for the http auth parameter , and any other configuration need to do ? Thanks .

What do you mean by client authentication? is it asking for user/pwd or do you have to provide a security certificate for the same?

If it is just asking for user/pwd then you can set user and pass fields for pub.client:http service.