I receive minimum wage plus commission. My employer offers discounts to customers via Groupon, Gilt.com, and various other discount websites. My employer pays me commission after discount instead of commission before discount. An example would be a recent discount that was offered through Travelzoo.com. Customer pays $99 for a $200 service voucher. I perform a $200 service to the customer but only receive commission on the $99. Is this legal?