private async Task <bool> IsMemberAsync( ulong userId, Func <CancellationToken, Task <IEnumerable <ulong> > > getGuildIdsDelegate, CancellationToken cancellationToken) { AuthenticationLogMessages.GuildIdsFetching(_logger, userId); var guildIds = await getGuildIdsDelegate.Invoke(cancellationToken); AuthenticationLogMessages.GuildIdsFetched(_logger, userId); return(guildIds .Intersect(_authorizationConfiguration.MemberGuildIds) .Any()); }