I have just installed this contribution and think it well written. but i have a small problem. can anyone tell me how to fix it?
the issue is that i want my customers to use a fixed coupon as in say $20 is applied to all orders greater than $25 , but if order is less than $25 then coupon can not be applied.
i tried several ways to acheive this but it seems the coupon gets applied regardless of the order being less than $25 which results in an undesirable negative order total. any help or advise will be well apreciated.
New 
