# Packages
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# Functions
计算支付平台手续费 Param rebat 费率小数().
根据支付类型和金额计算支付手续费.
计算支付手续费.
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# Constants
购物车.
直接购买.
支付宝支付.
线下打款.
微信支付.
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更新收货地址.
默认操作.
# Variables
数据库配置信息存储对象.
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# Structs
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# Type aliases
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