Adding new feature using PHP

Currently using one of the off the shelf Ecommerce templates that provides an admin section which you can place and manage you products. The way that currently I can have Options displayed in there is as dropdown, which automatically will add the options and the price of the product and displays the total. What I need is, in the admin page to have an Subscription option where when the customer selects it, it will automatically process payments on annual intervals for the amount of the subscription option which will be set by the admin. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform PHP & MySQL