This attribute is optional. It's intended for distinguishing marketplace and retail offers for shops that have mixed inventory.
Regular shops can completely ignore this (keep empty), for marketplaces it's strongly recommended to add information about which retailer (shop) sells the product.
Limit: maximum 50 characters
No, use only one attribute of this type per product
Add information about type of offer
Add original supplier name for marketplace offers
Product: Samsung QLED 55" pre owned tv
Offer type: marketplace
Retailer: Ex lease store LTD