The Coupon Codes are certain messages that if you put in the Coupon section, you get a reward. It can vary its prize depending on the code. The most known example are Badges. Not every code is available to redeem, some of them have expired, a good amount are still active. You can also get gold for coupon codes usually on KoGaMa friends, but on there were also a few codes.
Available Badges[ | ]
Currently badges that available to redeem with coupon codes are (with exception for event badges):
WWW: Monkey Badge[1], Fishy Joe[2], Standalone[3], Android[4], Michal[5], Follow Instagram kogama_official[6], KOGA Monster[7] and CoolCat[8].
Brazil: Standalone[3], Michal[5], Follow Instagram kogama_official[6], KOGA Monster[7], Peixe Joe[9] and Cool Cat[8].
Friends: Monkey Badge[1] and Fishy Joe[2].