Steam

ISteamUserAuth

ISteamUserAuth issues and validates Steam session tickets (AuthenticateUserTicket, AuthenticateUser) used by partner servers to verify a connecting player's Steam identity.

GitHub

Other Resources

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API Reference
https://partner.steamgames.com/doc/webapi/ISteamUserAuth

API entry from apis.yml

apis.yml Raw ↑ 
aid: steam:steam-user-auth-api
name: ISteamUserAuth
tags:
- Authentication
- Sessions
- Tickets
properties:
- url: https://partner.steamgames.com/doc/webapi/ISteamUserAuth
  type: API Reference
description: ISteamUserAuth issues and validates Steam session tickets (AuthenticateUserTicket, AuthenticateUser)
  used by partner servers to verify a connecting player's Steam identity.