No, Amazon does not charge referral fees on both sides for the same order if the order comes through an affiliate URL.
When an order is placed through an affiliate link, the affiliate earns a commission for driving the sale, which is paid out through the Amazon Associates program. The referral fee, which is the fee charged to the seller for selling on Amazon, is only charged once and is based on the product category and the sale price of the item. This fee is charged to the seller’s account, not the affiliate’s account.
