Motivation
动机
Provide a way for customer to add additional charge to WooCommerce checkout.
为客户提供一种向WooCommerce结帐添加额外费用的方法。
It is useful for site that would like to do delivery service.
对于想进行送信服务的网站有用。
Tipping service or anything that will allow customer to add a percent of their checkout price.
给小费服务或任何可以让客户增加其结帐价格百分之一的东西。
