A micropayment is a financial transaction involving a very small sum of money and usually one that occurs online. PayPal defines a micropayment as a transaction of less than 12 USD while Visa prefers transactions under 20 Australian dollars, and while micropayments were originally envisioned to involve much smaller sums of money, practical systems...
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http://en.wikipedia.org/wiki/Micropayment
Any payment which is too small in value to be economically feasible by a common payment mechanism, such as credit cards. Electronic means of micropayment are being implemented using mobile communications. The most common mobile micropayment mechanism is premium rate SMS messaging but other mechanisms J2ME and STK in the phone will allow larger transactions. All such applications require AAA (Internet shorthand for authentication, authorisation and accounting).
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http://www.encyclo.co.uk/visitor-contributions.php
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