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Electronic money is money that is exchanged electronically. This involves the use of computer networks, the Internet and digital stored value systems. Examples of electronic money are bank deposits, electronic funds transfer (EFT), direct deposit, payment processors, and digital currencies such as Bitcoin.
While electronic money has been an interesting problem for cryptography, to date, the use of e-money has been relatively low-scale. One rare success has been Hong Kong's Octopus card system, which started as a transit payment system and has grown into a widely used electronic money system. London Transport's Oyster card system remains essentially a contactless pre-paid travelcard. Two other cities have implemented functioning electronic money systems. Very similar to Hong Kong's Octopus card, Singapore has an electronic money program for its public transportation system (commuter trains, bus, etc.), based on the same type of (FeliCa) system invented by Sony and first deployed in Tokyo and Osaka, Japan. The Netherlands has also implemented a nationwide electronic money system known as Chipknip for general purpose, as well as OV-Chipkaart for transit fare collection. In Belgium, a payment service company, Proton, owned by 60 Belgian banks issuing stored value cards, was developed in 1995.
A number of electronic money systems use contactless payment transfer in order to facilitate easy payment and give the payee more confidence in not letting go of their electronic wallet during the transaction. The idea of a future with only electronic money has been met with controversy.
Many systems—such as PayPal, WebMoney, Payoneer, cashU, and Hub Culture's Ven—will sell their electronic currency directly to the end user, but other systems only sell through third party digital currency exchangers.
In Kenya, the M-Pesa system is being used to transfer money through mobile phones.
Decentralised electronic money systems include:
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A number of electronic money systems use contactless payment transfer in order to facilitate easy payment and give the payee more confidence in not letting go of their electronic wallet during the transaction.
A hard electronic currency is one that does not have services to dispute or reverse charges. In other words, it only supports non-reversible transactions. Reversing transactions, even in case of a legitimate error, unauthorized use, or failure of a vendor to supply goods is difficult, if not impossible. The advantage of this arrangement is that the operating costs of the electronic currency system are greatly reduced by not having to resolve payment disputes. Additionally, it allows the electronic currency transactions to clear instantly, making the funds available immediately to the recipient. This means that using hard electronic currency is more akin to a cash transaction. Examples are Western Union, KlickEx and Bitcoin.
A soft electronic currency is one that allows for reversal of payments, for example in case of fraud or disputes. Reversible payment methods generally have a "clearing time" of 72 hours or more. Examples are PayPal and credit card.
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