Cash app actually is an online wallet, so, it’s obvious that it would be running onto some kind of online platform either on web-based or app based. Having a centralized server on the internet, it takes the proper authentication from the user end to connect them with the server to make the transaction. In order to use the application, the user must first open an user account in order to make an handshaking process with the server using authentic credentials such as user and password. Like any other wallet base application it is required to add money on to the wallet to be able to use it anywhere depending on its marketability. So, this can be a brief way to say how does Cash app work.