Referral fee.

What Amazon and TikTok Shop call the cut they take for putting the listing in front of a buyer. Amazon sets it per category and charges a percentage of the total price or a minimum amount, whichever is greater: its pricing page puts Clothing and Accessories at 5% up to $15.00, 10% from there to $20.00 and 17% above it, with a $0.30 minimum, while Everything Else sits at 15%. A referral fee is not a POD royalty. The referral fee comes off a price you set on a product you already paid a fulfiller to make, so the marketplace percentage stacks on top of your unit cost; a royalty on Merch on Demand is the offer price less tax and less Amazon's costs, with a multiplier for the seller's royalty group, and the gross never passes through your account. One is a deduction from money that reached you. The other is the only line you ever see.