Friend Referral Prestashop Module

I can't find a module with the exact functionality that I want, so need to customise one or create from scratch. I have more work available if this project goes well - a LOT more work..! REFER A FRIEND For every 5 friends you successfully refer to a website (details to follow for successful applicant) a $100 voucher will be credited to your account for the next time you make a purchase. (is this trackable through website?) Step 1 Login to your account Create an account to start referring friends If you already have an account, login to your account and refer a friend Step 2 Fill in your friend’s email Click on add to refer more friends Step 3 Click send, an email will be sent to your friend(s) informing them about your recommendation. The process of account crediting needs to be automated. Please message me demonstrating that you've actually read the project brief - I don't have time for cut and paste spamming!!