Square Cash is a service that lets you request money from friends. Today you can CC the e-mail address firstname.lastname@example.org in an e-mail instead of email@example.com to request money from one or more friends. The recipients will receive an e-mail with a button that says “Send Cash.”
If you have requested money from multiple people, there will be a new page on Square’s website that lets you see who has paid and who hasn’t.
It is unknown how Square will actually make money with Square Cash.