financial viability–cost and revenue

uppose there’s an APP
When buying food and small items in our app, the supermarket gives us a 2-3% commission, and for large items such as household appliances, it is 5%-8%
Implementation of a recharged membership system, members enjoy cheaper prices and irregular coupons,
Other ordinary users need to spend money to buy coupons and do not enjoy preferential prices
You can buy things in every major supermarket in Sydney (through the app)and compare prices