private async Task <bool> IsSent(SendSmsCommand command) { var notificationReference = command.Message.Conversation.ConversationId; var notificationList = await _notificationClient.GetNotifications("sms", string.Empty, notificationReference); var lastNotification = notificationList.notifications .OrderByDescending(n => n.createdAt) .FirstOrDefault(); return(lastNotification == null || lastNotification.status == "delivered"); }