Goals/Requirements:
• As a first goal of the app is to manage users credit, like a wallet.
• Moving to next goal is to have a marketplace inside this app that belongs to the company where the users can buy and sell their stuff.
• The last but not least, actually the most important of all is to provide a logic for users where anyone can have what he wants from the marketplace even without money but you can pay with exchange for a service or for goods.