public void TestDeleteCard()
        {
            var c = _defaultService.CreateCard(new CardOptions()
            {
                Number   = "4242424242424242",
                ExpMonth = 12,
                ExpYear  = 2020,
                Name     = "A Customer"
            });
            var deleted = _defaultService.DeleteCard(c.Id);

            Assert.IsTrue(deleted.Number == "************4242");
        }