Mercari doesn’t process or permit partial refunds.
Instead of receiving a partial refund, we recommend that the buyer decide whether they want to keep the item or return everything to the seller to receive a full refund.
If the buyer decides to accept the item, the seller could offer a discount for the buyer’s next purchase.
Return requests must be made within 3 days of delivery. If the return is approved, all items will need to be returned in order to process the buyer’s refund. The buyer will be refunded the entire purchase price when the order is delivered back to the seller.