Hi, I'm Larry Thomas from New York, NY, USA. I'm technical expert. In order to ensure the 100% security of the users, Cash App has put in place a number of security features. Among so many features, one is Cash App PIN. You can think of the Cash App PIN as the first line of defense against hacking and unauthorized access to your Cash App account. Get into the profile section and tap the security tab to set up and reset your Cash App PIN. In case of any problem, feel free to contact the Cash App customer service.