I want to create an iOS app called “My2Cents” that allows users to easily send small amounts of money to each other, essentially pocket change. A user should be able to create an account with any of their social media accounts, log in, then add money to their balance via Apple Pay or other credit/debit card. Once they have added money, lets say $2, the user will then be able to add a user via username tag and freely send or receive a total of 2 cents every time they press a button. For example, if they have $2 total, they would be able to send a total of 2 cents, 100 times. I would also like the users to be able to create groups with their friends and be able to send money to a pool that could be used at a later time for real world goods. What .swift model files will I need for this project?