For those of you farmers that do direct sales and have considered getting one of the little plug-ins that lets you accept Credit and Debit cards wirelessly, here is the best comparative article I have seen on the different providers. Note also the ads in the right coloumn for some other providers. Also, PayPal is about to release its own system, and it has some good features, as long as you like PayPal. Keep in mind these mostly only work on Apple and Android phones.
Link to the compartive review of smart phone credit / debit swiping systems.
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