Hi, this is a great plugin, but i’m having one issue. I want an item to be added to the cart for free once $150 is spent. This works great, however, this is based on the SUBTOTAL, not the total. So what happens is they get this item, but then if there is a another coupon applied that drops the total below 150, the free item is still there. How can we make it so that the free item is applied when a minimum TOTAL (not subtotal) is spent?