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-> Need a Referral System
With this referral system, customers can invite people by Email, then the referrers will get the email they must click the special link provided in the email then register. Each time the referral buys a service, the customer who referred the referrer will receive 20% of there order.
So, to elaborate this;
1) Customer enters referrals Email
2) Referral clicks the link provided in the Email
3) Referral is taken to the registration page to register
4) Referral buys a service, for example "100 YouTube Subscribers"
5) Customer who referred the buyer then receives "20% of the cost" in there account. (100 subs = $2, customer who referred the referral will get $0.20)
6) Customer can spend the 10 subscribers, the page will look similar to this; http://gyazo.com/ba657f4300031b1a10a83f8ad65cab6a