This article discusses integration of PayPal Payment in ASP.NET web application. Nowadays PayPal is the most popular payment gateway worldwide because it is totally free to integrate and PayPal does not charge anything for opening an account, you will pay PayPal when you get paid. And the amount is also lower than other payment gateways.

PayPal supports several types of payments:

  • Payments for goods in the PayPal cart. PayPal is responsible for all operations supporting the cart in this case. Unfortunately, this option does not provide the maximum flexibility that is required to implement some projects, so the article does not consider this option.
  • Recurring billing or subscription. PayPal provides a subscription capability; that means that a definite sum will be periodically transferred from the user's account to the seller's account. The user can unsubscribe anytime. The seller can specify the subscription's period and cost. He also can organize a trial period to let the user assess the quality of services he provides. The trial period can be either paid or free.
  • "One click" shopping. Goods are not put into the cart in this case. This method also is used to pay for goods in a cart that was filled without PayPal. That's why this option provides maximum flexibility and full control of the cart.


Let’s start step by step work to integrate PayPal payment :

1.  Create PayPal account on PayPal Sandbox: Basically, PayPal provides an environment to developer that how they can integrate PayPal payment in their website. So just open URL: https://developer.paypal.com/ and click on SignUp option.

2. Create buyer (Personal Account) and one seller account (Business Account) PayPal account.

3. Having a valid PayPal API Token Key

4. Having PayPal business account email id

5. Create New Page on ASP.NET project and copy this script :

On ASPX PAGE:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"

    CodeFile="Default.aspx.cs" Inherits="_Default" %>

 

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">

</asp:Content>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">

    <div>

        <table width="700" align="center" cellpadding="0" cellspacing="0">

            <tr>

                <td height="60">

                    <b>Paypal Integration in ASP.NET</b>

                </td>

            </tr>

            <tr>

                <td height="40" align="center">

                    <asp:GridView ID="gvPayPal" runat="server" AutoGenerateColumns="False" OnRowCommand="gvPayPal_RowCommand"

                        BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px"

                        CellPadding="3" CellSpacing="2">

                        <RowStyle ForeColor="#8C4510" BackColor="#FFF7E7" />

                        <Columns>

                            <asp:TemplateField HeaderText="Product Name">

                                <ItemTemplate>

                                    <asp:Label ID="lblName" runat="server" Text='<%#Eval("prodName") %>'></asp:Label>

                                </ItemTemplate>

                            </asp:TemplateField>

                            <asp:TemplateField HeaderText="Product Description">

                                <ItemTemplate>

                                    <asp:Label ID="lblDescription" runat="server" Text='<%#Eval("prodDesc") %>'></asp:Label>

                                </ItemTemplate>

                            </asp:TemplateField>

                            <asp:TemplateField HeaderText="Product price">

                                <ItemTemplate>

                                    <asp:Label ID="lblProductPrice" runat="server" Text='<%#Eval("prodPrice") %>'></asp:Label>

                                </ItemTemplate>

                            </asp:TemplateField>

                            <asp:TemplateField HeaderText="Buy Now">

                                <ItemTemplate>

                                    <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/images/buy.png"

                                       Width="64" Height="64" CommandName="buy" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />

                                </ItemTemplate>

                            </asp:TemplateField>

                        </Columns>

                        <FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />

                        <PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />

                        <SelectedRowStyle BackColor="#738A9C" Font-Bold="True" ForeColor="White" />

                        <HeaderStyle BackColor="#A55129" Font-Bold="True" ForeColor="White" />

                        <SortedAscendingCellStyle BackColor="#FFF1D4" />

                        <SortedAscendingHeaderStyle BackColor="#B95C30" />

                        <SortedDescendingCellStyle BackColor="#F1E5CE" />

                        <SortedDescendingHeaderStyle BackColor="#93451F" />

                    </asp:GridView>

                </td>

            </tr>

        </table>

        <!-- PayPal Logo -->

        <table border="0" cellpadding="10" cellspacing="0" align="center">

            <tr>

                <td align="center">

                </td>

            </tr>

            <tr>

                <td align="center">

                    <a style="cursor:pointer;" title="Paypal payment gateway center" onclick="javascript:window.open('https://www.paypal.com/cgi-bin/webscr?cmd=xpt/Marketing/popup/OLCWhatIsPayPal-outside','olcwhatispaypal','toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=yes, resizable=yes, width=400, height=350');">

                        <img src="https://www.paypal.com/en_US/i/bnr/horizontal_solution_PPeCheck.gif" border="0"

                            alt="Solution Graphics"></a>

                </td>

            </tr>

        </table>

        <!-- PayPal Logo -->

    </div>

</asp:Content>

On CS PAGE :

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Configuration;

using System.Data.SqlClient;

using System.Data;

 

public partial class _Default : System.Web.UI.Page

{

    SqlConnection Con = new SqlConnection(ConfigurationManager.ConnectionStrings["ApplicationServices"].ToString());

    SqlCommand cmd = new SqlCommand();

    SqlDataAdapter da = new SqlDataAdapter();

    DataTable dt = new DataTable();

    DataRow dr;

 

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!Page.IsPostBack)

        {

            //Add some column to datatable display some products information           

            dt.Columns.Add("prodName");

            dt.Columns.Add("prodDesc");

            dt.Columns.Add("prodPrice");

 

            //Add rows with datatable and bind in the grid view

            dr = dt.NewRow();

            dr["prodName"] = "MindStick Cleaner";

            dr["prodDesc"] = "Cleans all system dummy data";

            dr["prodPrice"] = "$100.00";

            dt.Rows.Add(dr);

 

            dr = dt.NewRow();

            dr["prodName"] = "MindStick DataConverter";

            dr["prodDesc"] = "Helps to import export data in different format";

            dr["prodPrice"] = "$120.00";

            dt.Rows.Add(dr);

 

            dr = dt.NewRow();

            dr["prodName"] = "MindStick SurveyManager";

            dr["prodDesc"] = "Helps creating survey page with specified format dll";

            dr["prodPrice"] = "$140.00";

            dt.Rows.Add(dr);

 

            dr = dt.NewRow();

            dr["prodName"] = "MindStick TeraByte Importer";

            dr["prodDesc"] = "Data transfer utility";

            dr["prodPrice"] = "$30.00";

            dt.Rows.Add(dr);

 

            gvPayPal.DataSource = dt;

            gvPayPal.DataBind();

        }

    }

 

    protected void gvPayPal_RowCommand(object sender, GridViewCommandEventArgs e)

    {

        if (e.CommandName == "buy")

        {

            ImageButton ib = (ImageButton)e.CommandSource;

            int index = Convert.ToInt32(ib.CommandArgument);

            GridViewRow row = gvPayPal.Rows[index];

 

            //Get each Column label value from grid view and store it in label

            Label pName = (Label)row.FindControl("lblName");

            Label pDescription = (Label)row.FindControl("lblDescription");

            Label pPrice = (Label)row.FindControl("lblProductPrice");

 

            //Here store that person name who are going to make transaction

            Session["user"] = "Arun Singh";

 

            // make query string to store logged in user information in sql server table         

            string query = "";

            query = "insert into purchase(pname,pdesc,price,uname) values('" + pName.Text + "','" + pDescription.Text + "','" + pPrice.Text.Replace("$", "") + "','" + Session["user"].ToString() + "')";

            Con.Open();

            cmd = new SqlCommand(query, Con);

            cmd.ExecuteNonQuery();

            Con.Close();

 

            //Pay pal process Refer for what are the variable are need to send http://www.paypalobjects.com/IntegrationCenter/ic_std-variable-ref-buy-now.html

 

            string redirectUrl = "";

 

            //Mention URL to redirect content to paypal site

            redirectUrl += "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_xclick&business=" + ConfigurationManager.AppSettings["paypalemail"].ToString();

 

            //First name I assign static based on login details assign this value

            redirectUrl += "&first_name=Arun_Seller";

           

            //Product Name

            redirectUrl += "&item_name=" + pName.Text;

 

            //Product Amount

            redirectUrl += "&amount=" + pPrice.Text;

 

            //Business contact paypal EmailID

            redirectUrl += "&business=arunse_1358772383_biz@gmail.com";

 

            //Shipping charges if any, or available or using shopping cart system

            redirectUrl += "&shipping=5";

 

            //Handling charges if any, or available or using shopping cart system

            redirectUrl += "&handling=5";

 

            //Tax charges if any, or available or using shopping cart system

            redirectUrl += "&tax=5";

 

            //Quantiy of product, Here statically added quantity 1

            redirectUrl += "&quantity=1";

 

            //If transactioin has been successfully performed, redirect SuccessURL page- this page will be designed by developer

            redirectUrl += "&return=" + ConfigurationManager.AppSettings["SuccessURL"].ToString();

 

            //If transactioin has been failed, redirect FailedURL page- this page will be designed by developer

            redirectUrl += "&cancel_return=" + ConfigurationManager.AppSettings["FailedURL"].ToString();

 

            Response.Redirect(redirectUrl);

        }

    }

}

 

On DESIGN PAGE :

USE [MyDatabase]

GO

 

/****** Object:  Table [dbo].[purchase]    Script Date: 01/27/2013 09:26:07 ******/

SET ANSI_NULLS ON

GO

 

SET QUOTED_IDENTIFIER ON

GO

 

SET ANSI_PADDING ON

GO

 

CREATE TABLE [dbo].[purchase](

      [Id] [int] IDENTITY(1,1) NOT NULL,

      [PName] [nvarchar](100) NULL,

      [PDesc] [nvarchar](100) NULL,

      [Price] [money] NULL,

      [Uname] [varchar](50) NULL,

 CONSTRAINT [PK_purchase] PRIMARY KEY CLUSTERED

(

      [Id] ASC

)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]

) ON [PRIMARY]

 

GO

 

SET ANSI_PADDING OFF

GO

On web.config file:

<?xml version="1.0"?>

<!--

  For more information on how to configure your ASP.NET application, please visit

  http://go.microsoft.com/fwlink/?LinkId=169433

  -->

<configuration>

  <connectionStrings>

    <add name="ApplicationServices" connectionString="data source=Arun-PC;Integrated Security=true; Initial Catalog= MyDatabase; User Id= Arun-PC; Password= mindstick;" providerName="System.Data.SqlClient"/>

  </connectionStrings>

  <system.web>

    <compilation debug="true" targetFramework="4.0"/>

    <authentication mode="Forms">

      <forms loginUrl="~/Account/Login.aspx" timeout="2880"/>

    </authentication>

    <membership>

      <providers>

        <clear/>

        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/"/>

      </providers>

    </membership>

    <profile>

      <providers>

        <clear/>

        <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>

      </providers>

    </profile>

    <roleManager enabled="false">

      <providers>

        <clear/>

        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/"/>

        <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/"/>

      </providers>

    </roleManager>

  </system.web>

  <appSettings>

    <add key="token" value="(insert your paypal API Signature) "/>

    <add key="paypalemail" value="(insert with paypal login email id)"/>

    <!--Here i used sandbox site url only if you hosted in live change sandbox to live paypal URL-->

    <add key="PayPalSubmitUrl" value="https://www.sandbox.paypal.com/cgi-bin/webscr"/>

    <add key="FailedURL" value="http://localhost:49666/PayPalIntegration/Failed.aspx"/> <!--Failed Page URL-->

    <add key="SuccessURL" value="http://localhost:49666/Default.aspx"/> <!--Success Page URL-->

  </appSettings>

  <system.webServer>

    <modules runAllManagedModulesForAllRequests="true"/>

  </system.webServer>

</configuration>

6. Run the project to see the result.

 

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