public void GetPaymentsTest()
        {
            var payments = billingClient.GetPayments("918", DateTime.MinValue, DateTime.MaxValue).ToList();

            Assert.AreEqual(10, payments.Count);
            Assert.AreEqual(payments[0].ProductId, "1");
            Assert.AreEqual(payments[0].CartId, "11806812");
            Assert.AreEqual(payments[0].Currency, "EUR");
            Assert.AreEqual(payments[0].Date, new DateTime(2012, 4, 8, 13, 36, 30));
            Assert.AreEqual(payments[0].Email, "*****@*****.**");
            Assert.AreEqual(payments[0].Method, "PayPal");
            Assert.AreEqual(payments[0].Name, "Erik van der Zijden");
            Assert.AreEqual(payments[0].Price, 37.5);
        }