Retailers and eCommerce providers know that coupons are effective marketing tools for engaging customers and building loyalty to brands. Developers who create applications that are wishing to cash in on the coupon craze can look to ProgrammableWeb to find the best Application Programming Interfaces, or APIs, to distribute coupons, rewards, promo codes, and vouchers. To receive updates about Coupons APIs, click the TRACK THIS CATEGORY button below. And, if you want updates from other ProgrammableWeb categories, be sure to click the track button on those category pages as well.