How to Add Negative Values from Discounts on FreshBooks Integration?

I also wanted to know if it is possible to put a NEGATIVE value inside of a quantity box inside of the FreshBooks Integration. While making new products and trying to do negative values such as discounts, deductions, etc., I noticed that anytime I tried to save a product with a ''Negative" Price or Qty that I would get that "Only numeric value accepted" message. Any thoughts on this as well?

We do not currently support products with negative values. However, there is a special coupons option available on payment fields. Please take a look at the following guide.

How To Add Coupon Code in the Payment Form

You will not see the coupon itself at FreshBooks, but the price will be correct (discount price) at FreshBooks.

If you need any further assistance, please let us know.