public DoExpressCheckoutPaymentOperation(ExpressCheckoutApi ec, string token, string payerid, PaymentAction action)
            : base(ec)
        {
            RequestNVP.Method = "DoExpressCheckoutPayment";
            Token = token;
            PayerId = payerid;

            PaymentRequest(0).Action = action;
        }
 public DoExpressCheckoutPaymentOperation DoExpressCheckoutPayment(string token, string payerid, PaymentAction action)
 {
     return new DoExpressCheckoutPaymentOperation(this, token, payerid, action);
 }