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The system consists of pre-paid vending master station, prepayment meter and third-party vending system. The data of pre-paid vending master station data is encrypted and verified through a variety of ways to ensure the safety and reliability of the sale of electronic data transmission. After the pre-purchased electric energy is used up, users can recharge the meters via various methods such as mobile network, sales center and bank. The sales stuff can be divided into contact and non-contact types based on customer demand; it’s able to meet different customer needs with different vending modes for recharge.