In case you enter a discount code during checkout that doesn't exist or isn't currently active, then you can see the message: “Unable to find a valid discount matching the code entered”.

Surely yes, Sunmik's birthday is a special occasion for customers to enjoy a bunch of great discounts, and attached are valuable gifts you can miss out on.

Please check out Sunmik's site to be sure that there are available Sunmik coupons for promotions or Customer Service at that time. In case you are chosen to obtain those available coupons, you may receive your coupon by email, or a mailed catalog or postcard.

To avoid this problem, you should check out carefully Sunmik promo code before that promo code could be expired, some promo codes are tied to a minimum purchase, a first-time purchase, or tied to geography, and other reasons.

Usually, Coupon Stacking is not allowed at Sunmik. However, the store will surely give out notice if available.

Yes. The old coupons from Sunmik will be kept on the page if it has not expired. New coupons will continuously be updated.