As would be easier if you can slide a credit card with the iPhone? Well, according to an article on the game fresh, there is now a small player in the credit card available Self Edge store that plugs into a headset iPhone.
How it works is you type in the quantity needed for your card reader and the client application using h = finger and then sign their e-mail where to send invoices and payments are then processed by Square.
The reader of current credit card is small and can be with you for business and operations while you receive a map showing where the transaction took place on their records. N. word on the credit card when the player will be more widely available yet though.