Parallels offers a shop- and hostingsoftware named PBA:
[url removed, login to view]
We use this software a couple of years.
PBA is only able to give discount with a promotioncode on additional services, diffrent attributes or ressouces on a subscription/contract/order/invoice.
But it is not able, to give discount with a promotioncode on a complete summary price on an order/invoice which is maybe the simpliest way. ;)
So, I need a chance to give discount with a promotioncode on a complete order/invoice.
If needed I can give development-system for testing and development.