cash app refund Toll Free Now And Get Best Support For Transaction Issues Now. Call Now : 1-833-781-5270 Customer Service USA | Best OnSite Solutions Cash App Refund Support Phone Number +1 833 781 5270 Cash App is also known as square cash which is a mobile application-based payment service. Cash App was launched in 2015. Since 2015 Cash App has achieved over 7 million active users. In other words, Cash App is a web-based payment service just like PayPal and Venmo, however Cash App is very much simpler. With Cash App, one can transfer money to others just by using a cash tag name and/or phone number.