I have a client with a health website I am designing. What he wants is a membership area that people have to signup for and pay and are given a username and password for the area. The other part is that they want a shopping cart integrated with it so that members only can order.

So what I was thinking is just creating a members.domain.com subdomain for the members area only and using some sort of open source script for the subscription and member management, but I need something that can integrate with oscommerce so that members already have their info stored when they go to order.

Do any of you guys know of an open source member management software that fits the requirements. If not do you know of any commercial scripts that work great.

Thanks.