I have experience with Paypal, php, and MySQL. I can create an authentication mechanism, an account sign up and payment solution through Paypal, with a MySQL back end, pretty quickly and easily. I will provide a membership registration and payment solution, an authentication interface, and an authorization library interface you can use to limit access on the restricted pages of your site.
I will work on a 50/50 milestone basis. The first milestone must be posted before work can begin, and released before the code files are delivered. During the first milestone, you will be able to beta test the website on a development server, and will be expected to provide feedback. After the first milestone is released and I deliver the code files, I will help you install the system on your production server in any way feasible, and the remaining 50% of the project amount is expected to be delivered only after you are happy with your installation.
I look forward to working with you, and patiently await any questions you have for me, thanks!