A simple PHP Script to sell Proxies (with proxy checker and updating database)

No design efforts required. I need a simple script to do the following: 1. User logs into a website 2. User selects how many active proxies they need 3. The software generates a batch of proxies (however many they needed) 4. Generates a unique link for the user to download their list in a IP:PORT format I will also need a Paypal IPN set up to accept payments.