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With birth and expansion of the Internet, many electronic commerce systems have been developed and put into practice. At the same time, several electronic payment models are introduced. We analyze the famous JW model and N.Asokan model that are complicated and not concrete. Based on their works, we introduce the 3e payment model according to the payment tools and N.Asokan model. The 3e payment model includes electronic credit card payment model, electronic cash payment model and electronic check payment model. We compare and analyses the three payment models from the following aspects: actual pay time, transaction information, online/offline, user, current popular degree, anonymity, micro payment, small payment, large payment, database safeguarding, limit on amounts, direct cash-like payment model and direct cheque-like payment model. In the last we classify the available online payment protocols that include VCC, SET, VCPT, CyberCoin, DigiCash, MilliCent, Netcash, NetBill with our 3e payment model. At the same time we discuss the payment protocols properties that include security, accountability, atomicity, anonymity, non-repudiation and fairness.