Hi,
If someone wants to do this fix, I will be happy to integrate the modifications.
The problem is, that this special "virtual coupon" mode has been introduce in HikaShop because someone asked for but the development was not this integration was not the right one.
The original plugin had some features that we had to reimplement in the other mode, but because we do not use the same discount process (discount VS additional), we don't have the same features (like the shipping discount).
So there is some points to improve in the plugin, in order to load the shipping prices and make a fine total. On the other hand, we have to check in HikaShop if the "additional" could right modify the shipping price.
I want to split the "alpha user points" plugin in several plugins. One to gain points with order, one to be used as a payment plugin, one to generate automatic discounts.
The actual plugin is a mix of all, and it becomes really complicated to maintain (because the three features are really different)
Regards,