Updated 1/18/2019: Square has removed Square Wallet from the iTunes App Store and has publicly stated that the service is no longer a priority. Square Wallet was replaced with Square Order before it, too, was discontinued. At this time, Square Wallet is not an active product.
Square Wallet (squareup.com/wallet) is a free mobile wallet application offered by Square. Like LevelUp, PayPal, or the now-defunct Google Wallet, Square Wallet allows customers to pay at eligible stores using only their smartphones. All a user needs to do is download the free Square Wallet app, link his or her credit card, provide a photo, and activate the app in a Square Register-enabled location. The cashier will see the customer’s username and photo in the Square Register, and the customer can then pay by simply stating his or her username to the cashier. The Square Wallet can only be used at stores that utilize the Square Register point-of-sale system, which means that only Square merchants can offer this service to customers. Square made a splash in late 2012 by signing an agreement with Starbucks to enable all of its stores to accept Square Wallet payments.