public async Task SendMessageWithAttachmentIncomingWebhookAsync(LeaveRequest leaveRequest, string accessToken, string replyText, string userId)
        {
            _logger.Debug("SendMessageWithAttachmentIncomingWebhookAsync method");
            // getting attachment as a string to be send on slack
            var attachment = _attachmentRepository.SlackResponseAttachment(Convert.ToString(leaveRequest.Id), replyText);