买了胶带，使用点数付款，不算做正常消费吗？
必须现金付款的，才能获得100%back？
Staples客服：Please note that points are calculated after discounts and taxes after
application of all promotions, coupons, instant savings and point redemptions.
Taxes and shipping are not included in calculating the total purchase amount.
那么。。改天拿去退了，花$20买了一堆非必需品。