Here is what I'm searching for :

1) The "godfather" tell a friend (the godson) about myshoppingsite.com
2) the "godson" goes on myshoppingsite.com and purchase an item
3) When the order is confirmed, the godefather receives a coupon by email, with some discount for his next purchase

I can't find anything with a forum search.

Do someone know if something like that has been developped ?

Thanks in advance