SPL - Speed (Pvt.) Ltd. review for Steppun Discount

I cant tell you how much we got excited about your app it perfectly works fine and i am surprised these discounts coupon works with checkout. We are looking for a discount cap but they ware not working with checkout please I want to know how your app is working with checkout coupon field. As a developer just give me some case study about your app or any newsletter here is my email [email protected].