I have Integration Paypal Payment System to our website.When i got the job I don't have Any exprence to develope any payment system.I face somany Problem to intregate that systen.
So i am writing this bloge for the new devloper who is willing to Develop Paypel system with ASP.NET C#.
2a. Insert this code snippet into the section of your code that handles shopping cart.*
2b. Create these files to your shopping cart web directory
expresscheckout.aspx
expresscheckout.aspx.cs
using System;
using System.Web;
public partial class PayPalEC : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
NVPAPICaller test = new NVPAPICaller();
string retMsg = "";
string token = "";
if ( Session["payment_amt"] != null)
{
string amt = Session["payment_amt"].ToString();
bool ret = test.ShortcutExpressCheckout(amt, ref token, ref retMsg);
if (ret)
{
Session["token"] = token;
Response.Redirect( retMsg );
}
else
{
Response.Redirect("APIError.aspx?" + retMsg);
}
}
else
{
Response.Redirect( "APIError.aspx?ErrorCode=AmtMissing" );
}
}
}
APIError.aspx.cs
paypalfunctions.cs ( Please save this file into the AppCode sub directory of your .Net web app )
using System;
using System.Collections;
using System.Collections.Specialized;
using System.IO;
using System.Net;
using System.Text;
using System.Data;
using System.Configuration;
using System.Web;
///
/// Summary description for NVPAPICaller
///
public class NVPAPICaller
{
//private static readonly ILog log = LogManager.GetLogger(typeof(NVPAPICaller));
private string pendpointurl = "https://api-3t.paypal.com/nvp";
private const string CVV2 = "CVV2";
//Flag that determines the PayPal environment (live or sandbox)
private const bool bSandbox = true;
private const string SIGNATURE = "SIGNATURE";
private const string PWD = "PWD";
private const string ACCT = "ACCT";
public string APIUsername = "YourAPIUsername ";
private string APIPassword = "YourAPIPassword ";
private string APISignature = "YourSignature ";
private string Subject = "";
private string BNCode = "PP-ECWizard";
//HttpWebRequest Timeout specified in milliseconds
private const int Timeout = 5000;
private static readonly string[] SECURED_NVPS = new string[] { ACCT, CVV2, SIGNATURE, PWD };
///
/// Sets the API Credentials
///
///
///
///
///
public void SetCredentials(string Userid, string Pwd, string Signature)
{
APIUsername = Userid;
APIPassword = Pwd;
APISignature = Signature;
}
///
/// ShortcutExpressCheckout: The method that calls SetExpressCheckout API
///
///
///
///
///
public bool ShortcutExpressCheckout(string amt, ref string token, ref string retMsg)
{
string host = "www.paypal.com";
if (bSandbox)
{
pendpointurl = "https://api-3t.sandbox.paypal.com/nvp";
host = "www.sandbox.paypal.com";
}
string returnURL = "http://www.yourstore.com/OrderConfirmPage.aspx";
string cancelURL = "http://wwww.yourstore.com/MainPage.aspx";
NVPCodec encoder = new NVPCodec();
encoder["METHOD"] = "SetExpressCheckout";
encoder["RETURNURL"] = returnURL;
encoder["CANCELURL"] = cancelURL;
encoder["AMT"] = amt;
encoder["PAYMENTACTION"] = "Sale";
encoder["CURRENCYCODE"] = "USD";
string pStrrequestforNvp = encoder.Encode();
string pStresponsenvp = HttpCall(pStrrequestforNvp);
NVPCodec decoder = new NVPCodec();
decoder.Decode(pStresponsenvp);
string strAck = decoder["ACK"].ToLower();
if (strAck != null && (strAck == "success" strAck == "successwithwarning"))
{
token = decoder["TOKEN"];
string ECURL = "https://" + host + "/cgi-bin/webscr?cmd=_express-checkout&" + "&token=" + token;
retMsg = ECURL;
return true;
}
else
{
retMsg = "ErrorCode=" + decoder["L_ERRORCODE0"] + "&" +
"Desc=" + decoder["L_SHORTMESSAGE0"] + "&" +
"Desc2=" + decoder["L_LONGMESSAGE0"];
return false;
}
}
///
/// MarkExpressCheckout: The method that calls SetExpressCheckout API, invoked from the
/// Billing Page EC placement
///
///
///
///
///
public bool MarkExpressCheckout(string amt,
string shipToName, string shipToStreet, string shipToStreet2,
string shipToCity, string shipToState, string shipToZip,
string shipToCountryCode,ref string token, ref string retMsg)
{
string host = "www.paypal.com";
if (bSandbox)
{
pendpointurl = "https://api-3t.sandbox.paypal.com/nvp";
host = "www.sandbox.paypal.com";
}
string returnURL = "http://www.yourstore.com/OrderConfirmPage.aspx";
string cancelURL = "http://wwww.yourstore.com/MainPage.aspx";
NVPCodec encoder = new NVPCodec();
encoder["METHOD"] = "SetExpressCheckout";
encoder["RETURNURL"] = returnURL;
encoder["CANCELURL"] = cancelURL;
encoder["AMT"] = amt;
encoder["PAYMENTACTION"] = "Sale";
encoder["CURRENCYCODE"] = "USD";
//Optional Shipping Address entered on the merchant site
encoder["SHIPTONAME"] = shipToName;
encoder["SHIPTOSTREET"] = shipToStreet;
encoder["SHIPTOSTREET2"] = shipToStreet2;
encoder["SHIPTOCITY"] = shipToCity;
encoder["SHIPTOSTATE"] = shipToState;
encoder["SHIPTOZIP"] = shipToZip;
encoder["SHIPTOCOUNTRYCODE"]= shipToCountryCode;
string pStrrequestforNvp = encoder.Encode();
string pStresponsenvp = HttpCall(pStrrequestforNvp);
NVPCodec decoder = new NVPCodec();
decoder.Decode(pStresponsenvp);
string strAck = decoder["ACK"].ToLower();
if (strAck != null && (strAck == "success" strAck == "successwithwarning"))
{
token = decoder["TOKEN"];
string ECURL = "https://" + host + "/cgi-bin/webscr?cmd=_express-checkout&" + "&token=" + token;
retMsg = ECURL;
return true;
}
else
{
retMsg = "ErrorCode=" + decoder["L_ERRORCODE0"] + "&" +
"Desc=" + decoder["L_SHORTMESSAGE0"] + "&" +
"Desc2=" + decoder["L_LONGMESSAGE0"];
return false;
}
}
///
/// GetShippingDetails: The method that calls SetExpressCheckout API, invoked from the
/// Billing Page EC placement
///
///
///
///
public bool GetShippingDetails(string token, ref string PayerId, ref string ShippingAddress, ref string retMsg)
{
if (bSandbox)
{
pendpointurl = "https://api-3t.sandbox.paypal.com/nvp";
}
NVPCodec encoder = new NVPCodec();
encoder["METHOD"] = "GetExpressCheckoutDetails";
encoder["TOKEN"] = token;
string pStrrequestforNvp = encoder.Encode();
string pStresponsenvp = HttpCall( pStrrequestforNvp );
NVPCodec decoder = new NVPCodec();
decoder.Decode( pStresponsenvp );
string strAck = decoder["ACK"].ToLower();
if (strAck != null && (strAck == "success" strAck == "successwithwarning"))
{
ShippingAddress = "
| First Name | " + decoder["FIRSTNAME"] + " |
| Last Name | " + decoder["LASTNAME"] + " |
| Shipping Address | |
| Name | " + decoder["SHIPTONAME"] + " |
| Street1 | " + decoder["SHIPTOSTREET"] + " |
| Street2 | " + decoder["SHIPTOSTREET2"] + " |
| City | " + decoder["SHIPTOCITY"] + " |
| State | " + decoder["SHIPTOSTATE"] + " |
| Zip | " + decoder["SHIPTOZIP"] + " | ";
Insert this code snippet into the section of your code that handles billing
if (PaymentOption == "PayPal")
{
NVPAPICaller test = new NVPAPICaller();
string retMsg = "";
string token = "";
if (Session["payment_amt"] != null)
{
string amt = Session["payment_amt"].ToString();
//Optional Shipping Address entered on the merchant site
string shipToName = "
string shiptToStreet = "
string shiptToStreet2 = "
string shipToCity = "
string shipToState = "
string shipToZip = "
string shipToCountryCode = "
bool ret = test.MarkExpressCheckout(amt, shipToName, shipToStreet, shipToStreet2,
shipToCity, shipToState, shipToZip, shipToCountryCode,
ref token, ref retMsg);
if (ret)
{
Session["token"] = token;
Response.Redirect(retMsg);
}
else
{
Response.Redirect("APIError.aspx?" + retMsg);
}
}
else
{
Response.Redirect( "APIError.aspx?ErrorCode=AmtMissing" );
}
}
To pass the shipping address entered, replaced the shipping address placeholders in the code snippet with variables representing the shipping address from PayPal.
Save the total payment amount in a session variable named "Payment_Amount". The code inside the ExpressCheckout file is designed to read from this session variable and pass as input to the API call.
Order Review - get shipping address from PayPal
Insert this code snippet into the section of your code that handles order review
if (PaymentOption == "PayPal"){ NVPAPICaller test = new NVPAPICaller();
string retMsg = ""; string token = ""; string payerId = "";
token = Session["token"].ToString();
bool ret = test.GetShippingDetails( token, ref payerId, ref shippingAddress, ref retMsg ); if (ret) { Session["payerId"] = payerId; Response.Write ( shippingAddress ); } else { Response.Redirect("APIError.aspx?" + retMsg); }}
Save the total payment amount in a session variable named "Payment_Amount". The code inside the ExpressCheckout file is designed to read from this session variable and pass as input to the API call
Order Confirmation - confirm payment from PayPal
Insert this code snippet into the section of your code that handles order confirmation.
if (PaymentOption == "PayPal"){ NVPAPICaller test = new NVPAPICaller();
string retMsg = ""; string token = ""; string finalPaymentAmount = ""; string payerId = ""; NVPCodec decoder;
token = Session["token"].ToString(); payerId = Session["payerId"].ToString(); finalPaymentAmount = Session["payment_amt"].ToString();
bool ret = test.ConfirmPayment( finalPaymentAmount, token, PayerId, ref decoder, ref retMsg ); if (ret) { // Unique transaction ID of the payment. Note: If the PaymentAction of the request was Authorization or Order, this value is your AuthorizationID for use with the Authorization & Capture APIs. string transactionId = decoder["TRANSACTIONID"];
// The type of transaction Possible values: l cart l express-checkout string transactionType = decoder["TRANSACTIONTYPE"];
// Indicates whether the payment is instant or delayed. Possible values: l none l echeck l instant string paymentType = decoder["PAYMENTTYPE"];
// Time/date stamp of payment string orderTime = decoder["ORDERTIME"];
// The final amount charged, including any shipping and taxes from your Merchant Profile. string amt = decoder["AMT"];
// A three-character currency code for one of the currencies listed in PayPay-Supported Transactional Currencies. Default: USD. string currencyCode = decoder["CURRENCYCODE"]; // PayPal fee amount charged for the transaction string feeAmt = decoder["FEEAMT"];
// Amount deposited in your PayPal account after a currency conversion. string settleAmt = decoder["SETTLEAMT"];
// Tax charged on the transaction. string taxAmt = decoder["TAXAMT"];
//' Exchange rate if a currency conversion occurred. Relevant only if your are billing in their non-primary currency. If string exchangeRate = decoder["EXCHANGERATE"]; } else { Response.Redirect("APIError.aspx?" + retMsg); }}
