Discount Coupon
From Shopnix Help
What is Discount Coupon?
This allows the merchant to generate coupons for promotional purposes. There is a wide range of features, such as percentage off discounts, fixed amount discounts, in order amount etc.
Where I will get Discount Feature feature?
Go to store manager > MISC > DISCOUNT COUPONS
In the Show Discount Coupon with section lets you search the “DISCOUNT COUPONS” in the list
You can delete a discount coupon by clicking on the 
button.