Jonathan's Card is a social sharing experiment. Jonathan has offered his Starbucks card number to everyone to see if people will "take a coffee," and then "give a coffee" in return, much like, "need a penny, take a penny" trays in convenience stores.
Jonathan has also built a simple API to allow developers to build other applications on top of Jonathan's Card. The API methods supported are retrieving the card balance minute by minute, returning all activity on the card, reporting changes to the card's balance, and producing a summary of the card's activity.
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