One of the coupon types available to create is to create a coupon to deduct a specific amount from the order total or deduct a percentage of the total amount.
- Add specific amount to be deducted from order total regardless how much the order total is.
- The amount will be with the store default currency.
Discount Value will be a percentage from the total amount of order by adding the coupon code a 25% for example will be deducted from the total amount.
You Can refer to the discount coupon general setting article to determine the maximum and minimum amount for coupon to be used.