Referral commissions základní cena bez poplatku

This addon changes the way commissions are counted. Now it takes commissions from the basic (product or membership) price, not from the total cost (which is price + fee).

Example: 
Let's say you have a membership for sale, its price is $50.
Total fee added to the price is $10.
Total cost is 50 + 10 = $60.
The referral commission is 10%.
Without this addon the referral commission will be 10% from $60 which is $6.
With this addon the referral commission will be 10% from $50 which is $5. 

It makes much more sense to count the commission from the basic price than from the price + fee. The fee usually covers the payment processors fee so there is no reason to pay a commission from it.