JCB credit cards are not common in Singapore. In fact, only UOB carries the JCB credit card now. Its perks are mediocre – only 0.3% cash rebate for normal spend. However, it gives 6% cash rebate at your favourite Japanese merchants – Isetan, Meidi-Ya, Tokyu Hands, UNIQLO, Ichiban Boshi, Ichiban Sushi, Kuriya Dining, Kuriya Japanese Market and Sushi Tei with S$300 minimum spend per calendar month or 3% rebate with no minimum spend.
Currently, they have a promotion where you get $20 off $100 spend at Changi Airport T1-4 DFS Wine & Spirits (Departure Hall only). Do note that this is limited to the first 500 customers and valid in a single receipt only. If you are travelling before 31 May 2019, do reach the airport earlier and buy some alcohol before you board! 20% off is quite a big deal since there are hardly any promotions at Duty Free Singapore!