Problem with Hikashop + AvaTax + AWOCoupon

-- url of the page with the problem -- : www.weareecs.com/shop
-- HikaShop version -- : 3.2.2
-- Joomla version -- : 3.8.3
-- PHP version -- : 5.6.32

Hello all! This is likely a problem between AwoCoupon Pro, with Hikashop simply in the middle, but posting here first for visibility.

We recently migrated to Avalara/Avatax (Polished Geek's plugin) for tax calculation. For the most part, its been a flawless migration.

However, we use AWOCoupon Pro for discounts, as it seems to be the best and most stable thing out there.

Any purchase made w/ a discount code applied (to product, or to shipping) triggers the error in the screenshot below.

Looking at Avalara, it seems like it sees the discount, and everything should be fine, but there's definitely an issue somewhere.

Anybody run into this before? Or anybody running this combination of 3rd party plugins without running into this?

Hello, this is Deb from Polished Geek. I'm sorry to say that combining the AvaTax plugin with AWO's third party extension AWO Coupon is not supported. It handles taxes and coupon calculation completely differently from HikaShop. The AvaTax plugin is certified to work only with native HikaShop functionality.

If you have any issues with native HikaShop and our AvaTax Connector, don't hesitate to ask for free technical support at PolishedGeek.com/clients/contact.php

Yikes. That definitely wasn't clear from any documentation around any of the plugins or Hikashop core.

This causes severe issues in that Hikashop has no native functionality to do shipping discounts, and if I'm reading similar threads correctly, no plans to add one.

Yes, we would love to see HikaShop add native Shipping Coupons functionality as well.

AWO Coupon PRO is a wonderful extension. But there are just way too many features and different coupon types and combinations to make it something we can agree to develop and support for free. It's already quite a challenge to keep up with AvaTax global tax certification for HikaShop and HikaMarket functionality at times.

If and when HikaShop does decide to add native shipping discount features, we'll happily support them for AvaTax!