I have a another website that I have user log into. I want to pass the username from the other website to a wordpress plugin that logs the user in according to the username passed from the call. For example the plug would be called at [url removed, login to view] and the wordpress user that matches would be logged in and redirected to a page specified in the plugin settings.
I think this is a very straight forward request.
It should be something that would take about 30 minute to an hour to write for an experienced wordpress plugin developer.