public CustomerMonitorResponse CustomerMonitor(CustomerMonitorRequest request)
        {
            if (request == null)
                throw new ArgumentNullException("request");

            return SendGetRequest<CustomerMonitorRequest, CustomerMonitorResponse>(request, "CustomerMonitor");
        }
        public CustomerMonitorResponse CustomerMonitor(string merchantCustomerID, string merchantSessionID)
        {
            if (merchantCustomerID == null)
                throw new ArgumentNullException("merchantCustomerID");

            var request = new CustomerMonitorRequest
            {
                MerchantCustomerID = merchantCustomerID,
                MerchantSessionID = merchantSessionID
            };
            return CustomerMonitor(request);
        }