Implementing Stripe subscriptions in a .NET Core web application involves setting up your application to interact with the Stripe API for creating and managing subscriptions. Below is a step-by-step guide to get you started, along with advice, official documentation links, and best practices.

Step 1: Set Up Your Stripe Account and Obtain API Keys

• Sign up at Stripe: Create an account if you don't have one.

• Get API Keys:

  • Go to the Stripe Dashboard.

  • Navigate to the API Keys section under Developers.

  • Copy the Publishable Key and Secret Key.

Use the test keys for development and switch to live keys in production.

Click here for official Stripe API Keys Documentation

Step 2: Install the Stripe.NET SDK

1. Add the Stripe.NET NuGet package to your .NET Core project:

using Stripe;

2. Import the namespace in your project:

dotnet add package Stripe.net

Always keep he SDK updated to ensure compatibility with the latest Stripe features.

Step 3: Configure Stripe in Your Application

1. Add your Stripe API keys to your configuration file (e.g., appsettings.json):

{
    "Stripe": {
        "SecretKey": "sk_test_...",
        "PublishableKey": "pk_test_..."
    }
}

2. Load these keys in the Startup.cs or a configuration service:

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<StripeSettings>(Configuration.GetSection("Stripe"));
}

3. Create a settings class:

public class StripeSettings
{
    public string SecretKey { get; set; }
    public string PublishableKey { get; set; }
}

Never hardcode keys directly in your code; use environment variables or a secrets manager in production.

Step 4: Create Products and Pricing Plans in Stripe

1. Go to your Stripe Dashboard.

2. Under Products, create a product and set up pricing plans (e.g., monthly, annual).

3. Note the price_id for the plans you create

click here for Products and Prices Documentation.

Step 5: Implement Subscription Logic

1. Create a Customer: Use the Stripe API to create a customer:

2. Attach a Payment Method: Collect a payment method (e.g., credit card) using Stripe Elements on the frontend. Send the payment_method_id to your backend.

3. Create a Subscription: Once the customer and payment method are set up,

Use Stripe webhooks to handle subscription lifecycle events like payment success, failure, or cancellations.

Step 6: Handle Webhooks for Events

1. Set up a Webhook Endpoint:

   • In the Stripe Dashboard, configure a webhook endpoint to handle events (e.g., subscription created, invoice paid).

2. Verify Webhook Signatures:

var json = await new StreamReader(HttpContext.Request.Body).ReadToEndAsync();
var stripeEvent = EventUtility.ConstructEvent(
    json,
    Request.Headers["Stripe-Signature"],
    "your_webhook_secret"
);

3. Process Events:

if (stripeEvent.Type == Events.InvoicePaid)
{
    // Handle successful payment
}
else if (stripeEvent.Type == Events.CustomerSubscriptionDeleted)
{
    // Handle subscription cancellation
}

• Always validate webhook signatures to ensure security.

• Implement idempotency to avoid processing the same event multiple times.

Step 7: Test Your Implementation

1. Use Stripe's test mode to simulate different scenarios (e.g., successful payments, failed payments).

2. Test using the test card numbers provided by Stripe.

Step 8: Deploy and Monitor

1. Switch to live API keys in production.

2. Monitor logs and events in the Stripe Dashboard.

Best Practices

• Secure Your API Keys: Use environment variables or secret management tools.

• Handle Errors Gracefully: Log errors and provide user-friendly messages.

• Use Webhooks Extensively: To stay updated on subscription events and automate workflows.

• Ensure Compliance: Follow Stripe’s compliance guidelines for handling payment data.

By integrating Stripe subscriptions into your .NET Core application, you can unlock recurring revenue streams while providing a smooth customer experience. With Stripe's robust API, you can build flexible, scalable subscription systems tailored to your business needs.

Whether you're a developer implementing this for your organization or a client looking to monetize services, this guide provides the foundation to get started.

👉 Resources:

• Stripe Billing Documentation

• Stripe API Reference

• Stripe.NET GitHub

By leveraging Stripe’s robust subscription tools and integrating them into your .NET Core web application, you’re not just adding a payment gateway—you’re building a foundation for consistent, scalable revenue growth.