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Today's world is Internet world. Now-a-day popularity of E-commerce is increasing tremendously. Using E-commerce people do their financial transaction online like online shopping etc. Most popular mode for online and offline payment is using credit card, use of credit card has dramatically increased. So as credit card is becoming popular mode for online financial transactions, at the same time fraud associated with it are also rising. In this paper, Hidden Markov Model (HMM) is used to model the sequence of operation in credit card transaction processing.
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