We sell virtual goods. You will receive a subscription for paid website access or paid client access correlating to the item that you are purchasing.
Each subscription is only valid for one account and may be hardware ID locked.
It means that you can not share access with other computers and/or users.
Due to the characteristics of the digital product, which is a serial number or activation key, you can not request a refund or exchange it even you cannot use it from your system incompatibility.
All the users have their own risk and responsibility to stand punishment from the game by using this program.
So, the only reason your payment can be refunded – key is not valid for activation of subscription. Pay attention, that period during which you can return invalid key is specified at the purchase page. (e.g. you can't return 1-day key 2 days after purchase)