In hotcard app user can buy virtual card, which can be used in our partner companies as coupon for discount or used for 1+1 deals for service. referal system works like example below: when our employee registers new user which buys card part of revenue will be transferred to employee. In application there is a list of all our partners including their current location and when user allows app to use their location there will be suggestions according to users location. Also, user can see how much money he/she saved by using our card.