Stripe is one of the most popular gateways to implement credit card payment processing in web applications. Stripe provides an API that is used in a Web application. In this blog, we will see how to use the Stripe API to integrate credit card payment processing in an ASP.NET Web app using C#.

Here are the steps. Keep in mind I'm using a test account.

Step 1. Go to https://stripe.com/ to create an account and get API keys.

Step 2. Download the attached project, get Sripe.dll and Newtonsoft.Json.dll from the Bin Foder, and add references to your project.

Step 3. Create a simple ASP.NET Website and create a simple page with a button.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
        </div>
    </form>
</body>
</html>

On the button click event handler, we will execute Stripe API code.

Step 4. Add code to .cs file.

Here is the code-behind looks like.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Stripe;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // Page Load logic goes here
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        StripeCustomer current = GetCustomer();

        // Uncomment the following lines if you have a method getaTraildays()
        // int? days = getaTraildays();
        // if (days != null)
        // {
        int chargetotal = 100; // Convert.ToInt32((3.33 * Convert.ToInt32(days) * 100));

        var mycharge = new StripeChargeCreateOptions();
        mycharge.AmountInCents = chargetotal;
        mycharge.Currency = "USD";
        mycharge.CustomerId = current.Id;

        string key = "sk_test_Uvk2cHkpYRTC2Rl4ZUfs4Fvs";
        var chargeservice = new StripeChargeService(key);
        StripeCharge currentcharge = chargeservice.Create(mycharge);

        // }
    }

    private StripeCustomer GetCustomer()
    {
        var mycust = new StripeCustomerCreateOptions();
        mycust.Email = "[email protected]";
        mycust.Description = "Rahul Pandey([email protected])";
        mycust.CardNumber = "4242424242424242";
        mycust.CardExpirationMonth = "10";
        mycust.CardExpirationYear = "2014";
        // mycust.PlanId = "100";
        mycust.CardName = "Rahul Pandey";
        mycust.CardAddressCity = "ABC";
        mycust.CardAddressCountry = "USA";
        mycust.CardAddressLine1 = "asbcd";
        // mycust.TrialEnd = getrialend();

        var customerservice = new StripeCustomerService("sk_test_Uvk2cHkpYRTC2Rl4ZUfs4Fvs");
        return customerservice.Create(mycust);
    }
}

In the above code, we create a Customer and provide customer details, including credit card details. StripeCharge is the object responsible for charging.

Step 5. Build and run, and you should be able to execute a test payment transaction.

For more, please download the code.

Here is a detailed tutorial: Implement Stripe Payment Gateway In ASP.NET MVC