There are basically multiple types of discount coupon. Some require codes which need to be applied during checkout, while others require to click only. Please make sure to read the review and instructions in 2018 as well.
We provide active Seerecon coupons only when publishing. But some of the promo might not be 100% working after a certain time, if they expire. We try to remove the expiring one immediately and replace them with a new one.