Amazon has one of the most amazing affiliate features I have ever seen, with the ability to have under one associate ID at least 100 astores in all categories of products that amazon has to offer, therefore the potential to create many different niches of products and through this you also have the opportunity to refer someone to buy gift certificates which is a great affiliate bonus feature that yields powerful results, especially those who would like to shop with these easy to use certificates.
Gift certificates are like the gold of many online and actual shops in the offline world as you can give these away as gifts to anyone you know and thus you can refer them to receive these certificates to put towards the purchase of anything that the gift certificates are for.
Promoting online gift certificates are easy if you have maybe your own site or blog or even subscriber list, so that you can present either small ads or even describe the benefits of using these discount coupons for any purchases online and offline, then you can....but don't just settle for these areas of promotions.
Gift certificates are far reaching beyond the confines of your website or your own promotional boundaries, they can now be put so far out there that anyone can literally see the benefits of gift certificates for their own online and offline purchases, just think of not only Amazon but many retail shops and stores use these gift cards and other named discount coupons to drive extra sales to their establishments.
So remember when you see the gift certificates in the many forms online and offline they are there for one main reason and that's to increase sales and interest in products and achieve the companies profit margins successfully, because everyone loves discounts and ways of avoiding paying directly with cold hard cash.