Simple and urgent php script

This project consists of 2 parts: [login to view URL] need a very simple web form, which uploads a text file, reads 2 different strings from each line and adds it to a MySQL database [login to view URL] have a paypal payment/link generator php script that needs to be modified. Currently, it generates and presents a link to the file the customer has paid for through paypal. It reads the original file path from a text file and generates the download link based on this file path. Since we offer a separate file for each individual customer, the script must be modified so that the file path is changed to the next available file after each one is bought/downloaded . These file paths are recorded in the same mysql DB used in the first part. There is a full documentation available for the script and applying this modification seems to be an easy task. Our budget is $40 only, and the project should not take more than 3-4 hours for a php coder. please bid only if you can start ASAP.