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dorseyTwitter creator Jack Dorsey just launched the site for his up-and-coming mobile payments startup Square.

Square’s product lets people process credit card payments through their mobile phone. It’s a small device that attaches to the audio input jack of a phone. You can swipe your card through a slot on the device and the store can send the receipt to either your e-mail or mobile phone. You can also use text messages to authorize payments in real-time.

Dorsey recently found new space for the company in San Francisco’s SoMA district and the startup has been testing its technology in local coffee shops like Sightglass. Square is backed by Khosla Ventures and other angels.

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Receipts look like this:

square-receipt

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