Voucher codes originally were called coupons and the first ones were used in 1888 by Coca Cola where they issued paper coupons in the US for free bottles of coca cola, its estimated that between 1894 and 1913 8.5 million bottles of coca cola were given away free of charge making it a phenomenal marketing campaign.
In 1909 1 cent coupons were issued to consumers to buy breakfast cereals.
In 1940 big chain grocery shops introduced coupons to attract consumers away from small local markets and since then grocery coupons and vouchers have allowed more than 4.6 billion dollars in savings for consumers.
1990 and the invention of the internet allowed for printable coupons and online vouchers, giving customers incentives to purchase goods from online stores.
2014 and you can source a coupon or voucher for almost anything from online stores, to restaurants and visitor attractions, the majority of vouchers are found online as well as in magazines, newspapers and marketing material.