Usage patterns
クーポンを使うto use a coupon
If you use this coupon, you get 10% off.
クーポンをもらうto receive a coupon
I got a discount coupon from the store clerk.
クーポンが使えるthe coupon can be used (is valid)
This coupon can also be used online.
クーポンを配布するto distribute coupons
The company distributed coupons to new customers.