Pay Pal Integration In Asp.Net

Introduction

If you are developing an ASP.NET web application and you require some payment gateway integration, then here is a simplified option to integrate PayPal with your application.

** A PayPal account can be used only for international transactions. You can not use it for domestic transactions. If you want the solution for domestic purpose then integrate CCAvenue or some other gateway, those provide domestic transactions.

Here I am going to explain this with a piece of code, which will be easier to understand and impliment. So lets start

Using The Code

<div>
    <span >Your Name:</span>
    <asp:TextBox runat="server" ValidationGroup="save" ID="txtName"
 ></asp:TextBox>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator2" ControlToValidate="
 txtPurpose"
        ErrorMessage="Please enter your Name" runat="server" 
        ValidationGroup="save" ForeColor="red"></asp:RequiredFieldValidator>
    <br />
    <br />
    <span>Your Email Id:</span><asp:TextBox runat="server" 
 ValidationGroup="save"        
        ID="txtEmailId"></asp:TextBox>
    <asp:RegularExpressionValidator ID="regexEmailValid" runat="server" 
        ValidationExpression="\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"
        ControlToValidate="txtEmailId" ValidationGroup="save" 
        ErrorMessage="Invalid Email Format" 
        ForeColor="red"></asp:RegularExpressionValidator><br />
    <br />
    <span>Your Phone No:</span>
    <asp:TextBox runat="server" ID="txtPhone" ValidationGroup="save" ></asp:TextBox>
    <asp:RegularExpressionValidator ID="RegularExpressionValidator4" runat="server" 
 ControlToValidate="txtPhone"
        ForeColor="red" ErrorMessage="Invalid Phone No"
        ValidationGroup="save" ValidationExpression="^([0-9\(\)\/\+ \-]*)$">
  </asp:RegularExpressionValidator>
    <br />
    <br />
    <span>Enter Amount:</span><asp:TextBox runat="server" ID="txtAmount" 
 ValidationGroup="save"
        ></asp:TextBox>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="
 txtAmount"
        runat="server" ForeColor="red" ErrorMessage="Please enter the amount."><
  /asp:RequiredFieldValidator>
    <br />
    <br />
    <span>Currency:</span>
    <asp:DropDownList runat="server" ID="ddlCurrency" >
        <asp:ListItem>- Select -</asp:ListItem>
        <asp:ListItem>INR</asp:ListItem>
        <asp:ListItem>USD</asp:ListItem>
        <asp:ListItem>EURO</asp:ListItem>
        <asp:ListItem>Pound</asp:ListItem>
    </asp:DropDownList>
    <br />
    <br />
    <span >Your Purpose:</span><asp:TextBox TextMode="MultiLine" 
        Rows="10" runat="server" ID="txtPurpose"
        Height="50px" 
       ></asp:TextBox>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator6" ControlToValidate="
 txtPurpose"
        ErrorMessage="Can not be left blank" ValidationGroup="save" 
        runat="server" ForeColor="red"></asp:RequiredFieldValidator>
    <br />
    <asp:Button ID="btnPay" runat="server" Text="Pay Now" CssClass="button"
  OnClick="btnPay_AsPerYourChoice" ValidationGroup="save"></asp:Button>
</div>

Now go to the code behind page of the webform and add the below method in it.

An important thing to notice is I am using the live URL of PayPal as this functionality is implemented in my live server. You can use the Sandbox URL of PayPal for testing purposes. 

protected void PayWithPayPal(string amount, string itemInfo, string name, 
          string phone, string email, string currency)
{
    string redirecturl = "";

    //Mention URL to redirect content to paypal site
    redirecturl += "https://www.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=" + name;

    //City i assign static based on login user detail you change this value
    redirecturl += "&city=bhubaneswar";

    //State i assign static based on login user detail you change this value
    redirecturl += "&state=Odisha";

    //Product Name
    redirecturl += "&item_name=" + itemInfo;

    //Product Name
    redirecturl += "&amount=" + amount;

    //Phone No
    redirecturl += "&night_phone_a=" + phone;

    //Product Name
    redirecturl += "&item_name=" + itemInfo;

    //Address 
    redirecturl += "&address1=" + email;

    //Business contact id
    // redirecturl += "&business=yourmail@gmail.com";

    //Shipping charges if any
    redirecturl += "&shipping=0";

    //Handling charges if any
    redirecturl += "&handling=0";

    //Tax amount if any
    redirecturl += "&tax=0";

    //Add quatity i added one only statically 
    redirecturl += "&quantity=1";

    //Currency code 
    redirecturl += "&currency=" + currency;

    //Success return page url
    redirecturl += "&return=" + 
      ConfigurationManager.AppSettings["SuccessURL"].ToString();

    //Failed return page url
    redirecturl += "&cancel_return=" + 
      ConfigurationManager.AppSettings["FailedURL"].ToString();

    Response.Redirect(redirecturl);
}

OK, that is fine. Now before running your application you need to add something in your web.config file. Just add the below shown appsetting code snippet to your web config file under the system.web tag. Here you have to give information regarding your PayPal account, your PayPal email ID , PayPal submit URL, your website success URL, failure URL, etc.

<appSettings>
 <add key="token" value="PW1BDVNqVPVanwduF_Tb2Ey91aT1Uhx1kL7HPc-7e8S-6AnUwSSHyasolSe"/>
 <add key="paypalemail" value="yourmail@gmail.com"/>

 <!--Here i used sandbox site url only if you hosted in live change sandbox to live 
 paypal URL-->
 <add key="PayPalSubmitUrl" value="https://www.paypal.com/cgi-bin/webscr"/>

 <add key="FailedURL" value="http://www.xyz.com/ProceedToPayment.aspx"/>

 <add key="SuccessURL" value="http://www.xyz.com/ProceedToPayment.aspx"/>

</appSettings>

Now you can run your application to see if its working or not.

Happy Coding...