I'd like our coupon codes to be able to affect the price post-shipping, in other words, if I have a $20 one-time-use coupon code, and I buy a $15 item with $6 shipping, it charges me $1... As of now, seems like it is only capable of subtracting the $15 cart price.
We reward volunteers with coupon codes, would be nice if they could get stuff truly for free as a result. Some of them are in America some are around the world, so their shipping rates will vary as well.
Is there a known way I could implement this? Or is it part of FoxyCart 2.0? Etc? Thank you.