public async Task <Models.Address> CreateAsync(Models.Address address)
        {
            if (address == null)
            {
                return(null);
            }

            address.SetDefaultValues();

            var documentDbProvider = new DocumentDBProvider();

            var response = await documentDbProvider.CreateAddressAsync(address);

            return(response.StatusCode == HttpStatusCode.Created ? (dynamic)response.Resource : (Guid?)null);
        }