Selling

Pick the game and category, give the item a reference (what it actually is) and a title/description, then set a price. Most categories are priced as a single flat price for the whole listing.

A currency/quantity category instead asks for a price per unit, how much stock is available, and a minimum order quantity -- buyers then pick how much to buy, and your remaining stock updates automatically as orders come in.

For codes, keys, or credentials, open "Manage stock" on your listing (in My Listings) and paste in your stock, one code per line. As soon as a listing has any stock attached, purchases against it deliver instantly -- the buyer sees the code the moment payment clears, and the trade completes without you needing to do anything.

The listing itself stays active and purchasable by multiple buyers as long as it has stock; it only shows as out of stock once every unit has been claimed. Adding more stock at any time makes it purchasable again immediately -- no need to relist.

You'll get a notification once stock on a listing runs low, so you can top it up before it actually runs out.

An active listing can be edited (title, description, price) or cancelled at any time before a trade locks it. Once a unique-item listing is mid-trade it's locked until that trade resolves; currency and inventory-backed listings stay active through a sale since they can still serve other buyers.

New accounts may have a cap on how many active listings they can run and how high a single listing can be priced, until they build trading history (see Seller levels). These caps loosen automatically as your account levels up -- there's nothing to request manually.