Create a shopping cart that allows the client to add/remove/edit products. The main product they will be selling is "memberships" and will need the ability to change pricing, titles, dates, etc.
Once the "product" or "membership" is selected by the user they are taken to a secure page that captures the user’s information. Once they hit submit then information/order is emailed SECURELY to client and credit card is charged manually by the client.
Explanation: How this would work is a user would go to your website, fill out a form, hit submit and the user’s information would be emailed to my client. My client will manually charge that card. The most important aspect to this project is that the page is secured and the information transfers secrely.