I asked my local LLM to generate a Blazor WASM implementation for Stripe using its Stripe.net NuGet package. I've had it generate it at least 3 times based on slightly different prompts but after all, I'm not satisfied with the result.

I am aware that an A.I. like Claude or CoPilot could muster up a more complete and accurate solution maybe we'll get to that later. For now, I'm using A.I. as inspiration, a starting point or an alternative viewpoint.

See how I manually implemented it in the past: Stripe Checkout with Minimal API in C# .NET 8

Prompt

Can you give me the Blazor WASM implementation for Stripe's Payment flow using the Stripe.net NuGet package?

Answer

Implementing Stripe's payment flow in a Blazor WebAssembly (WASM) app requires careful consideration of security and sensitive data handling. Here is a basic example of how to integrate Stripe into your Blazor app:

First, you'll need to install the Stripe.net package via NuGet:

dotnet add package Stripe.net

Next, create a new Razor component for processing payments. This example uses a simple form for demonstration purposes.

//stripe_payment.razor

@code {
    [Inject]
    public StripeConfiguration StripeConfig { get; set; }

    private string _paymentIntentId = null;
    private bool _isProcessing = false;

    void CreatePaymentIntent()
    {
        var options = new PaymentIntentCreateOptions
        {
            Amount = 999,
            Currency = "usd",
            PaymentMethodTypes = new List<string> { "card" },
        };

        StripeConfiguration.CreatePaymentIntent(options, out _paymentIntentId);
    }

    void ConfirmCardPayment()
    {
        if (!_isProcessing)
        {
            try
            {
                _isProcessing = true;
                var options = new PaymentIntentConfirmOptions
                {
                    PaymentIntentId = _paymentIntentId,
                    PaymentMethodId = "pm_1H9VZ3EaQ7R2n5",
                };
                StripeConfiguration.ConfirmPaymentIntent(options);
            }
            catch (Exception e)
            {
                // Handle errors here
            }
            finally
            {
                _isProcessing = false;
            }
        }
    }

    void HandleStripeError(string errorMessage)
    {
        Console.WriteLine($"Stripe Error: {errorMessage}");
    }
}

And then in your Blazor component, you can use the following code to display a form for user input and initiate payment:

// PaymentForm.razor

<h1>Payment Form</h1>

<form @onsubmit="HandleFormSubmission">
    <div class="form-group">
        <label for="cardNumber">Card Number:</label>
        <input type="text" id="cardNumber" name="cardNumber" placeholder="4242424242424242" />
    </div>
    <div class="form-group">
        <label for="expMonth">Expiration Month:</label>
        <select id="expMonth" name="expMonth">
            <option value="12">December</option>
            <!-- Add the rest of your months here -->
        </select>
    </div>
    <button type="submit" class="btn btn-primary" @onclick="ConfirmCardPayment">
        Pay $999.99
    </button>
</form>

@code {
    private string _cardNumber = "";
    private string _expMonth = "";

    void HandleFormSubmission()
    {
        CreatePaymentIntent();
    }
}

And here's how to inject Stripe in your blazor app (typically in Program.cs):

//Program.cs

var builder = WebAssemblyHostBuilder.CreateDefault(args);

builder.Services.AddSingleton<StripeConfiguration>();

Note that this is a simplified example. Always ensure you're handling sensitive information securely, and verify your Stripe API keys are properly set up in your environment.

Also remember to call CreatePaymentIntent() every time the payment form needs to be refreshed.

Every now and then I have to prioritize work, life or other matters but we'll soon continue with the ML Basics on YouTube

Kind regards, Auguste @ kiss-code