AKS-Grocery store project on Google firebase server

This project is to develop website as well as app in android, ios and windows using tools which will support google firebase server and integrating paytm as payment gateway. this project is interface between : Customer and retailer : Customer will buy from retailer. Retailer will enter the items he has in his store and fix his price. Distributor and Retailer : retailer will purchase items with distributor. Agent: will register the retailers and distributors. Customer will be mapped with nearest location of retailer. retailer will be mapped with nearest location of distributor. Customer will have choice to select retailer before payment and choose his choice retailer depending on price quoted by retailer for the items ordered. Same goes with Retailer purchasing from distributor. there will be referals for customer, retailer and distributor and agents and they will earn on references. payment gateway will be integrated for all of these. Rough flow is attached for reference if asked by the bidder.