You will have to provide your legal username, DOB (you must be 18+), location, mobile number, email address, bank detail, etc to use a Cash app account. Here, you can also create $Cashtag, which is a unique identifier created by the user that used to make a transaction. To know more information, please talk to a Cash app representative. https://www.dellsupportme.com/cash-app-support-number/