I'm developing a new web site for a State affiliate of a National organization using Wordpress. My client wishes to have a members only section on their web site. They want it set up so that when a web visitors attempts to login on the WP site using the same login credentials they have for the National site, a SOAP request is made to the SQL server database on the National site that validates the login credentials and returns a true/false and tells the WP site to grant access to the members pages or not. Attached is some documentation provided by the national web site. I have found the following WP plugin that may help speed configuration but need assistance setting this up.