Betterbatter review for Amai Upsell+ Volume Discounts

I loved everything about the customer service and nearly everything about the app.... (easy interface, clear design, elegant, easy to use and navigate) BUT at checkout our customers couldn't use discount codes, and this lead to a lot of abandonment when we were testing the app.and a lot - a LOT - of manual fixing of orders and helping resolve unhappiness. So unfortunately we couldn't use the app :( Would totally re-up if this were resolved and fixed