http://www.superstarcoders.com/blogs/posts/paypal-with-asp-net-mvc.aspx
public class CartController : Controller
{
public ActionResult Index()
{
return View();
}
public ActionResult Pay()
{
PayPalRedirect redirect = PayPal.ExpressCheckout(new PayPalOrder { Amount = 50 });
Session["token"] = redirect.Token;
return new RedirectResult(redirect.Url);
}
}
Here is the PayPal API code that you can include in your solution or a separate library:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Collections.Specialized;
using System.Net;
using System.IO;
using System.Globalization;
public class PayPal
{
public static PayPalRedirect ExpressCheckout(PayPalOrder order)
{
NameValueCollection values = new NameValueCollection();
values["METHOD"] = "SetExpressCheckout";
values["RETURNURL"] = PayPalSettings.ReturnUrl;
values["CANCELURL"] = PayPalSettings.CancelUrl;
values["AMT"] = "";
values["PAYMENTACTION"] = "Sale";
values["CURRENCYCODE"] = "GBP";
values["BUTTONSOURCE"] = "PP-ECWizard";
values["USER"] = PayPalSettings.Username;
values["PWD"] = PayPalSettings.Password;
values["SIGNATURE"] = PayPalSettings.Signature;
values["SUBJECT"] = "";
values["VERSION"] = "2.3";
values["AMT"] = order.Amount.ToString(CultureInfo.InvariantCulture);
values = Submit(values);
string ack = values["ACK"].ToLower();
if (ack == "success" || ack == "successwithwarning")
{
return new PayPalRedirect
{
Token = values["TOKEN"],
Url = String.Format("https://{0}/cgi-bin/webscr?cmd=_express-checkout&token={1}",
PayPalSettings.CgiDomain, values["TOKEN"])
};
}
else
{
throw new Exception(values["L_LONGMESSAGE0"]);
}
}
private static NameValueCollection Submit(NameValueCollection values)
{
string data = String.Join("&", values.Cast<string>()
.Select(key => String.Format("{0}={1}", key, HttpUtility.UrlEncode(values[key]))));
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(
String.Format("https://{0}/nvp",PayPalSettings.ApiDomain));
request.Method = "POST";
request.ContentLength = data.Length;
using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
{
writer.Write(data);
}
using (StreamReader reader = new StreamReader(request.GetResponse().GetResponseStream()))
{
return HttpUtility.ParseQueryString(reader.ReadToEnd());
}
}
}
