I am working with Cash App I will discuss with you some facts and common queries about this amazing application. Cash App by Square is a digital payment that allows direct peer to peer payments via your mobile phone. Cash App requires you to open an account. You need to be a U.S. resident and at least 18 years old. If you want to use your account balance to send money to another Cash App user, then you will need to give us some more information about you, so that we can verify your identity.