- salesPrice : per unit price of the product
- orderPrice : salesPrice (per unit price) x shippingCount (order quantity)
- discountPrice : discounted price after application of instant discount coupon or cart/category coupon, etc.
Basically, Coupang does not apply 3P seller's cart/category coupon.
If those coupons are applied, Coupang pays for them. So it doesn't have any impact on the seller's settlement amount.