信用卡返现服务.
cash back 返现（就是有时候花足了多少钱,然后会返回现金多少）
是一种促销手段,超市购物、信用卡、手机等都有返现活动.
facility用复数多解释为：便利,设备,器材,工具,装置; 机构
从下文的网站解释,以及出现过这个词的网站来看,facility应该解释为一种方便服务.这种服务现在一般使用在开通返现服务的信用卡上.
大意是指,你在用信用卡购物的时候,根据购物的金额大小,由信用卡银行为你支付部分费用（即返现,1%~6%的单次消费金额）.不过,只有在开通了此服务的店（不仅超市,煤气站,药店等）消费,才能享有.
参考：
The latest value layer which is named SET Cash Back Facility,allowing customers access and withdraw cash from
their accounts at the same time and they do their shopping in the same premises.
This facility not only serves as a time saving method,but also as an invaluable way of obtaining cash in an emergency
when you are away from an ATM.
返现信用卡的好处参见：
已经使用者对此服务的评价：
我就不翻译了,大概的意思基本已经说清楚了.
