How to retrieve checkout information when using Stripe SDK - asp.net

Question

Here is my Cart and Checkout process in my web application
My purpose is after checkout, I retrieve the payment information like transaction Id or payment reference
In my ASP.NET MVC 5 application, I have following code in Cart View
<div>
#using (Html.BeginForm("", "Cart", FormMethod.Post))
{
... here I show products in cart ...
... NOTE that I don't have any action in my form ...
<input type="submit" id="stripe-checkout-button" value="Checkout" />
}
</div>
<script type="text/javascript">
var stripe = Stripe('#ViewBag.StripePublishKey');
var checkoutButton = document.getElementById('stripe-checkout-button');
checkoutButton.addEventListener('click', function () {
fetch('https://localhost:44323/Cart/CreateCheckoutSession', {
method: 'POST'
})
.then(function(response) {
return response.json();
})
.then(function(session) {
return stripe.redirectToCheckout({ sessionId: session.id });
})
.then(function(result) {
if (result.error) {
alert(result.error.message);
}
})
.catch(function(error) {
console.error('Error:', error);
});
});
</script>
In Cart controller I have following actions
[HttpPost]
public ActionResult CreateCheckoutSession()
{
var cart = (ShoppingCart)Session["cart"];
var options = new SessionCreateOptions
{
PaymentMethodTypes = new List<string> { "card" },
Mode = "payment",
SuccessUrl = Url.Action("CheckoutSuccessful", "Cart", null, Request.Url.Scheme),
CancelUrl = Url.Action("CheckoutCancelled", "Cart", null, Request.Url.Scheme),
PaymentIntentData = new SessionPaymentIntentDataOptions
{
CaptureMethod = "manual"
},
LineItems = new List<SessionLineItemOptions>()
};
foreach (var item in cart.Items)
{
// here I add the purchased product. I remove the code for simplification
}
var service = new SessionService();
Session session = service.Create(options);
ViewBag.SessionId = session.Id;
return Json(new { id = session.Id });
}
public ActionResult CheckoutSuccessful(string sessionId)
{
// sessionId is null here. I'm even not sure if I need this parameter
ShoppingCart cart = (ShoppingCart)Session["cart"];
return RedirectToAction("Index", "Checkout");
}
public ActionResult CheckoutCancelled()
{
return RedirectToAction("Index", "Cart");
}
When I click on Checkout button, the application redirects to Stripe payment page and I can enter email and billing information and click pay. It works well and payment goes through.
Based on my setting, the application redirects to CheckoutSuccessful action after that.
What I am missing here is, in CheckoutSuccessful action, I need to retrieve email address and billing address plus payment or transaction Id. I don't know how to do that.
In CheckoutSuccessful, the parameter sessionId is null. I don't know what I've done wrong here or what I'm missing.
Thanks for help.

Answer 1

You can ensure that the newly created Checkout Session ID is included in your success URL by appending {CHECKOUT_SESSION_ID to the success URL: https://stripe.com/docs/payments/checkout/custom-success-page#modify-success-url
Then on your success URL you can grab the Session ID from the query params and retrieve the Checkout Session.

Answer 2

After a few days research and try out, I figured it out.
After creating session, I need to store the session.Id in Http Session and in CheckoutSuccessful method (which does not need any parameter), I need to call couple of APIs to retrieve session and payment information like below:
var service = new SessionService();
var session = service.Get(the stored session.Id);
var custService = new CustomerService();
var customer = custService.Get(session.CustomerId);
var paymentService = new PaymentIntentService();
var payment = paymentService.Get(session.PaymentIntentId);
Then, I will have all required infromation in session, customer and payment objects.