Endpoints Publisher API

Publisher API Endpoints

Publisher calls require a Steamworks publisher key and must run on a trusted server.

Use a separate client so privileged credentials are not mixed with a normal Web API key:

use TeemoCell\SteamWebApi\Client;

$publisher = (new Client(apiKey: $publisherKey))->publisher();

Methods

Method	Description
`CheckAppOwnership(int	string $steamId, int $appId)`
GetNewsForAppAuthed(...)	Returns authenticated app-news data.
`GetInventory(int $appId, int	string $steamId)`
GetItemDefs(int $appId, array $filters = [])	Returns decoded item definitions, including names and images.
GetPriceSheet(int $currency)	Returns Inventory Service store prices for a currency.

$ownership = $publisher->CheckAppOwnership(
    steamId: $steamId,
    appId: 620,
);

Inventory Service

$items = $publisher->GetInventory($appId, $steamId);

$definitions = $publisher->GetItemDefs($appId, [
    'modifiedsince' => '20260720T000000Z',
]);

$prices = $publisher->GetPriceSheet($currency);

GetInventory() and GetItemDefs() decode Steam's embedded item_json and itemdef_json values into arrays. Item definitions may contain icon_url, icon_url_large, marketable, tradable, names and descriptions.

GetPriceSheet() returns prices configured for the Steam Inventory Service. It does not return current Community Market resale prices.

Publisher keys must never be sent to browser JavaScript, mobile apps, desktop clients or game clients. Keep calls server-side and restrict access to their results. See Security.