virtual [TFuture](API\Runtime\Core\Async\TFuture)< [TOnlineResult](API\Plugins\OnlineServicesInterface\Online\TOnlineResult)< [FRejectSessionInvite](API\Plugins\OnlineServicesInterface\Online\FRejectSessionInvite) > > RejectSessionInviteImpl ( const [FRejectSessionInvite::Params](API\Plugins\OnlineServicesInterface\Online\FRejectSessionInvite\Params) & Params )