Reward Program Extension

We need a developer to find and install a extension that already exist. We dont want the developer to create from scratch. The extension must do those actions below or near to. - 5% discount freely to hole shopping cart, 1 per user, per period > if user click on share in a product - User friend also earns the 5% discount when clicks the link - Price will be set to this kind of discount AND the usualdiscount - It can be found in the web site today. E.g.: De: R$310,00 Por: R$209,00 > there will be 3 prices - accumulative discounts to user which friends had bought from his social media share. E.g.: if I share a product and 20 users buy from my link, I will pay only for the shipping (20 coupons of 5% = 100%) - more discount AFTER the checkout if user shares that HE bought is stronger than a simple share - allow user to connect to his hotmail or gmail and share to his e-mails friends too Basicly what are my latest conclusions: We will give 5% discount freely to hole shopping cart, 1 per user, per period > if user click on share in a product I have installed something that does that in [login to view URL] * User friend also earns the 5% discount when clicks the link Basicly the price will be set to this kind of discount AND the usualdiscount the can be found in the web site today. E.g.: De: R$310,00 Por: R$209,00 > there will be 3 prices We will give accumulative discounts to user which friends had bought from his social media share. E.g.: if I share a product and 20 users buy from my link, I will pay only for the shipping (20 coupons of 5% = 100%) We will give more discount AFTER the checkout if user shares that HE bought is stronger than a simple share I want to allow user to connect to his hotmail or gmail and share to his e-mails friends too (look [login to view URL]) (5% is a symbolic number for scenario propuse. This math must be proper made)