public BillingAddress GetDefaultBillingAddress()
        {
            var streets = new[]
            {
                estimationSettings.SenderAddressLine1,
                estimationSettings.SenderAddressLine2,
            }.Where(i => !string.IsNullOrEmpty(i)).ToList();

            string countryName = estimationSettings.SenderCountry;
            string stateName   = estimationSettings.SenderState;
            int    countryId   = CountryInfoProvider.GetCountryInfoByCode(countryName).CountryID;
            int    stateId     = StateInfoProvider.GetStateInfoByCode(stateName).StateID;

            return(new BillingAddress()
            {
                Street = streets,
                City = estimationSettings.SenderCity,
                Country = countryName,
                CountryId = countryId,
                Zip = estimationSettings.SenderPostal,
                State = stateName,
                StateId = stateId
            });
        }