Visual Studio Package Manager:

Install-Package SteamWebAPI2

.NET Core CLI:

dotnet add package SteamWebAPI2

• Get a Steam Web API key. Don't expose this key to your users.
• Use that key to create a factory. The factory generates interfaces to communicate with the Steam Web API.
• This should be a singleton. There's no reason to have multiple factories.

var webInterfaceFactory = new SteamWebInterfaceFactory(<dev api key here>);

• Use the CreateSteamWebInterface method to generate an interface.
• T determines the type of interface you want to create.
• List of all interfaces in the Valve Steam Web API
• List of supported interfaces in this library

webInterfaceFactory.CreateSteamWebInterface<T>();

Example to get a player profile summary:

var steamUserInterface = webInterfaceFactory.CreateSteamWebInterface<SteamUser>();
var playerSummaryResponse = await steamUserInterface.GetPlayerSummaryAsync(<steamIdHere>);
var playerSummaryData = playerSummaryResponse.Data;