public void addMetadata()
        {
            /* The current url, oauth_token, orgId and Terminal Id provided in this example, are only for testing purposes
            *  For development purposes you need to contact the Payhub Integration Support team. They will provide you with  *  all you need.
            *  Thanks.
            */
            //Defining the Web Service URL
            string url = "https://sandbox-api.payhub.com/api/v2/";
            string oauth = "2a5d6a73-d294-4fba-bfba-957a4948d4a3";

            Merchant merchant = new Merchant();
            merchant.organization_id = 10074;
            merchant.terminal_id = 134;

            Bill bill = new Bill();
            bill.Base_amount = (decimal)7.00m;
            bill.Shipping_amount = (decimal)2.00m;
            bill.Tax_amount = (decimal)1.00m;
            bill.note = "";
            bill.invoice_number = "";
            bill.po_number = "";
            CardData card_data = new CardData();
            card_data.card_number = "4055011111111111";
            card_data.card_expiry_date = "202012";
            card_data.billing_address_1 = "123 Happy St";
            card_data.billing_address_2 = "On the corner";
            card_data.billing_city = "San Rafael";
            card_data.billing_state = "CA";
            card_data.billing_zip = "12345";
            card_data.cvv_data = "999";
            Customer customer = new Customer();
            customer.first_name = "Joe";
            customer.last_name = "Tester";
            customer.company_name = "Payhub Inc";
            customer.job_title = "Software Engineer";
            customer.email_address = "*****@*****.**";
            customer.web_address = "http://payhub.com";
            customer.phone_number = "844-217-1631";
            customer.phone_ext = "123";
            customer.phone_type = "W";
            Sale sale = new Sale(merchant, bill, card_data, customer);

            TransactionManager transaction = new TransactionManager(url, oauth, merchant);
            SaleResponseInformation saleResponse = transaction.doSale(sale);
            if (saleResponse.errors == null) {
                string datos = "{\"order\": {\"id\": 465, \"invoice\":\"MyIncoice\", \"lines\": [{\"City\": \"Cordoba\"}, {\"Neighborhood\": \"Nueva Cordoba\"}]}}";
                transaction.addMetaData(datos, TransactionType.Sale, saleResponse.SaleResponse.SaleId);
                SaleResponseInformation saleResponseMetadata = transaction.getSaleInformation(saleResponse.SaleResponse.SaleId);
                Console.Write(saleResponseMetadata.metaData);
            }
        }