public RefundTransactionTests()
        {
            const string url            = "https://secure.paygate.co.za/payhost/process.trans";
            const string merchantId     = "10011064270"; //No 3d secure redirect on this merchantId
            const string merchantSecret = "test";        //This is the merchantSecret paired with above merchantId

            _paygateService = new PaygateService(url, merchantId, merchantSecret);
        }