Connect (API) Forums to Payment System

This job has 2 steps: 1. Migrate our Forums to our own Servers (currently hosted by Invision Power Board) (Forum software is Invision Power Board) 2. Connect the Forums to our Payment System (allow forum registration and access only to our paying customers (past, present, future) We want to restrict access to our forums to people who have bought our English lessons. We use E-Junkie to process orders and deliver download files. We have a merchant account and paypal account (all orders go through E-junkie, which is connected to the above accounts). So we need to integrate the payment records and system with our forums.. so that people who bought the lessons in the past continue to have access, but non-buyers will no longer have access. New buyer would automatically gain access to forum registration and login.