While you are making any transaction, then it asks for a PIN, which is generated by you at the time of adding a bank account, credit card, debit card, etc. So you can say that, if you don't share this information with anyone, then there is not any chance of fraud payment. Even support team monitors your account on regular basis. If still any issues, then click here to get Cash app customer service . https://www.contact-customer-service.net/customer-service/Cash-app