In order to have a completed overview of the electronic payment systems, a categorization of different types of electronic payment systems is necessary. There are many different researches about the types of electronic payment, and different authors used different criteria to categorize these systems.

In the basic classification of e-payment systems, two criteria was used to categorize the electronic payment system: pre-paid, pay-now or pay-later and online or offline transaction

If we use the pre-paid, pay-now, or pay-later criterion, we will have following systems:

1. Pre-paid : Customer pays before the transaction (e.g. she buys electronic tokens,tickets, coins,...and uses them to pay for her transactions)

2. Pay-now: The customer’s account is checked and debited at the same time when the transaction takes place (ex: internet banking...)

3. Pay-later (credit-based) : Customer pays after the transaction (ex: credit card ...)

If we use the second criterion, we will have

1. On-line: A third party (the bank) is involved in the transaction in real-time.

2. Off-line: The bank (or financial organization) is not involved in real-time in the transaction.

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