Onepica/avatax Wrong Coupon (by percent) calculation

We integrate a lot of 3rd Party Extensions and run in to different issues when the extension is free. Now we have integrated “Avatax” ¬†with one of our client magento and we got¬†issue that discount is not calulating as expected Ex :

Exprected :$8.8 We found out the issue with Avatax and got lucky Read more about Onepica/avatax Wrong Coupon (by percent) calculation[…]