Indeed, Cash App Customer Service requests your SSN to check your identity. It is fundamentally requested any government hostile to illegal tax avoidance and against tax avoidance. Here is a law, that makes it important to give your SSN. You don't have a need to enter your full SSN, enter just last four digits of it. Having such kind of warning permits them to affirm your identity, and by which they can easily catch dubious action. https://www.cash-app-customer-service.com/