Slow charge is the use of the group purchase model, the principle of which is: when the merchant receives the top-up payment, it will not immediately send your payment request to the operator, but after the accumulation of many people's payment request to the operator.
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In this case, the amount of network communication is only once, and the amount of a single submission will be relatively large, and you can enjoy the cost concessions provided by the operator.
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Just like group buying, \"slow charge\" is slow in the business to gather the number of people, cheap because more people can give a certain degree of discount.