Square Cash allows users to easily send payments to others via email. To send a payment, users address an email to the recipient, CC firstname.lastname@example.org, include the amount in dollars in the subject line, and can write an optional message in the body of the message. First-time users and recipients will receive an email from Square to link their debit cards to send and receive funds, and subsequent transfers will be automatic. Square Cash works through any email client, as well as the Square Cash app for iOS and Android.
images via Square Cash