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目前Internet网上的电子商务离线系统中多采用定额支付的方式，而不具有找零功能。针对这种给交易带来不便、影响电子商务推广的支付方式，本文提出了一种能在定额范围内随意支付的安全技术方案。
At present, online e-commerce offline systems use fixed-amount payment instead of change-free function. In view of this inconvenience to the transaction, affecting the payment of e-commerce promotion, this paper presents a security technology that can be paid within the scope of quota.