public void Vault()
{
Result<Customer> customerResult = gateway.Customer.Create(new CustomerRequest());
Assert.IsTrue(customerResult.IsSuccess());
PaymentMethodRequest request = new PaymentMethodRequest()
{
CustomerId = customerResult.Target.Id,
PaymentMethodNonce = Nonce.Coinbase
};
var createResult = gateway.PaymentMethod.Create(request);
Assert.IsTrue(createResult.IsSuccess());
var findResult = gateway.PaymentMethod.Find(createResult.Target.Token);
Assert.IsTrue(findResult is CoinbaseAccount);
}