Coupon Generation Android App

I am looking to get developed and designed a website for users to generate online shopping coupons themselves online. Users will be able to select the products and after selecting the products they themselves will add the value for purchasing the product worth upto Rs.500/-. Whatever value they will add in their wallet, 10% of that amount will be added in their wallet for purchasing only grocery from our website. After adding that money, payment will be made to that merchant from where customer is purchasing the products offline. This website will drive online customers to their nearby stores. After generating the coupon, user should be able to take the printout of the coupons as well as it will be sent to their mail also and one sms should go to their registered mobile numbers. There should be QR code on their coupons which should be able to be scanned by merchants. After scanning the QR code, it should be redeemed and not able to use further. I mainly want developers who would like to work as per my conditions. I'll award the project after the 25% project is done. I'll create first 25% milestone after 50% work done. 25% will be done after 75% work completed. Remaining 50% will be done after the work completion. There should be online payment gateway to be integrated. There should be seller and buyer panel and dashboard. There should be beautiful menu and logo developed by designer and developer. Source code will be our property.