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Using online coupon codes is a prevalent online activity, but one characterized by a poor user experience. Inaccurate, expired, and false coupon codes are a major problem online. This study looks into the accuracy and reliability of major coupon code websites and presents detailed findings from its analysis of 550 coupon codes across 40 retail brands.
An online version of this document is available here: https://blog.zipfworks.com/online-coupon-code-accuracy-study/