There are many ways to buy stuff in internet. We can surf through the website, select the items we want to buy then make payment using credit cards. This website is quite restricted or specified in certain area or industry.
Now we can buy items using coupon code. Pay money to get the code of the item you wish to buy, and then redeem it. It is simple, easy and cheaper. Cheaper is because they offer discounts on coupon. Instead of paying cash in stores, we can use the code to make payment, another advantage which is safer.