An enum that specifies the type of action related to the party and user that this notification holds. It can be retrieved by using
ovr_PartyUpdateNotification_GetAction().ovrPartyUpdateAction_Join: The user is going to join the party.ovrPartyUpdateAction_Leave: The user is going to leave the party.ovrPartyUpdateAction_Invite: The user is invited to the party.ovrPartyUpdateAction_Uninvite: The user is uninvited from the party.