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TopThere are different online payment systems on Internet. As stated in Chum (2004) some of the major online payment systems are as follows:
MyCheckFree.com: popular electronic payment system that allows you to receive your bills directly to your email and pay any billers who are affiliates, including major department stores, clothing chains and even commercial banks.
Paytrust: the most comprehensive online bill paying service that allows you to pay any bill electronically, even to billers that don't allow electronic payment; PayTrust receives your bills, scans them, sends you email notification and allows you to access bills online for a year, plus keeps electronic payment records for eight years; but costs at least $5 per month plus 50 cents every time you receive or pay a bill, and is not compatible with Quicken.
CCNow: shopping cart electronic payment system that accepts all major credit cards.
ProPay: electronic payment system that processes credit cards through the Internet via touch-tone phones; used to make purchases at mobile businesses, trade shows/fairs and taxis.
iKobo: electronic payment system that allows you to send and receive money in more than 170 countries.
Moneybookers: electronic payment system that allows you to send and receive online payments in real time via email from your credit card or bank account.
Authorize.net: electronic payment system, recently acquired by CyberSource Corp. that serves as the electronic payment gateway for businesses from sports entertainment and gourmet foods to government and religion.
Chum (2004) studied the characteristics of the online payment systems using a set of criteria. Table 1 shows what the eight studied systems have in common and in difference according to the set of criteria.
Table 1. Electronic payment systems (EPS) from Chum (2004)
| EPS | Atractivity | Cost | Use ability | Speed | Security | Universality |
| MyCheckFree.com | 2 | 3 | 1 | 3 | 1 | 2 |
| Paytrust | 1 | 1 | 3 | 3 | 3 | 2 |
| CCNow | 2 | 1 | 1 | 2 | 2 | 1 |
| ProPay | 2 | 2 | 1 | 3 | 1 | 1 |
| iKobo | 1 | 3 | 1 | 2 | 1 | 1 |
| Moneybookers | 2 | 1 | 2 | 1 | 1 | 2 |
| Authorize.net | 1 | 2 | 1 | 3 | 3 | 1 |