I have a product which asks user to register. I want to integrate an automated referral system into the emails I send out to my existing customers so that if they refer my app to any of their friends and the friends purchase it, both the friend and them get some discount. I checked zferral and hasoffers but both of them are for affiliates. I am looking for a easily integrable referral system like vonage to keep track.
Thanks.
Trusting third parties with the email addresses of all your customers and prospects is not always wise.