ISteamUser::GetAuthSessionTicket now takes an extra parameter: const SteamNetworkingIdentity *pIdentityRemote.
"The identity of the remote system that will authenticate the ticket. If it is peer-to-peer then the user steam ID. If it is a game server, then the game server steam ID may be used if it was obtained from a trusted 3rd party, otherwise use the IP address. If it is a service, a string identifier of that service if one if provided."
ISteamUser::GetAuthSessionTicket
now takes an extra parameter:const SteamNetworkingIdentity *pIdentityRemote
."The identity of the remote system that will authenticate the ticket. If it is peer-to-peer then the user steam ID. If it is a game server, then the game server steam ID may be used if it was obtained from a trusted 3rd party, otherwise use the IP address. If it is a service, a string identifier of that service if one if provided."