private RestRequest CreateRestRequest(SmsRequest smsRequest, string smsMessage)
        {
            var restRequest = new RestRequest(Method.POST);

            restRequest.AddParameter("username", _reachConfiguration.Username);
            restRequest.AddParameter("password", _reachConfiguration.Password);
            restRequest.AddParameter("msisdn", _smsNumberFormatter.Format(smsRequest.ToNumber));
            restRequest.AddParameter("message", smsMessage);
            restRequest.AddParameter("originator", _reachConfiguration.Originator);
            restRequest.AddParameter("callbackurl", _reachConfiguration.CallbackUrl);

            return(restRequest);
        }