User guide 1:
How to enjoy "tiered discounts"？
User guide 2:
How to enjoy "special add-on discount"?
User guide 3:
How to enjoy "spend-and-get free gift offers"?
User guide 4:
How to enjoy the "buy selected products and get a free gift offer"?
User guide 5:
How to enjoy the "buy one, get one free discount"?
