Troubleshooting Klarna and Webhook Integration Issues with 8.x-1.2 Module

Hi @aleddr,

There are a variety of reasons why the Klarna payment method is not showing up.

Reviewing Stripe's Klarna documentation may be helpful. See: https://docs.stripe.com/payments/klarna

Some possibilities:

• The customer address is not in a supported country. Check the current list at the link referenced above.
• The currency is not supported. Check the current list at the link referenced above.
• The amount of the order is below the Klarna minimum. This can change, so hesitant to specify a number in this thread, but if you are doing a $1 test transaction, you won't get it as a payment option. I would suggest $100 for a test amount.
• The Payment Gateway is configured for "Setup Future Usage" with a value of "On-session" or "Off-session". These values allow you to "re-use" the payment method. Since Klarna is essentially a micro-loan, approved on a case by case basis, you normally would need to set the value to "Single use". Stripe and Klarna, though, do have the intention of allowing recurring payments, based on the link above, offering a "Private Preview Sign Up" option. For now, only "Single use" has been tested supported, though the other values may be supported with Klarna in the future.

IRT the webhook signing secret, ensure that you also are in "Test Mode" in stripe when creating the webhook. You don't want to send webhooks from prod to your test environment. Also, I'm presuming you are using the URL provided when you configured your payment gateway, but the pattern you mentioned does not look right. It should be https://[your site domain]/payment/notify/[your payment gateway machine name], e.g. https://www.example.com/payment/notify/my_stripe_gateway

Thank you so much @tomtech! We had similar issues and your comment gave the right anwser!
I opened an issue to improve the UX: 🐛 Payment Element: Better use effect of the "Payment method usage" setting Active

Maybe the debug steps should be added to the README.md?

@anybody,

Glad these comments were helpful for you!

We are working on additional documentation...it gets challenging, though, because stripe is churning a lot, and what is true today may not be true tomorrow.

Case in point...when I was making the comment #4 above, I pulled up the link I referenced, and noticed the new "Private Preview" for recurring payments with Klarna. Previously, that value was "No".

Hi @TomTech,
I really appreciate your contribution and your availability, and I thank you very much.

I still need to ask for support to better understand and resolve the issue.

In the meantime, I confirm that I am testing in a Drupal development environment, on Stripe in Test Mode, and the sensitive data shared is anonymized but consistent.
I have performed checks and tests based on your suggestions, and here are the results.

Webhook events result in a 500 Internal Server Error

Regarding "Webhook events result in a 500 Internal Server Error", which impacts all transactions, I have made progress by reconfiguring:

• the WebHook on Stripe
• the "Default Checkout flows" on Drupal, adding "Stripe review" in the Review stage, while leaving "Setup future usage" set to "None".

I no longer get the error
No signatures found matching the expected signature for payload...
, but now I have this error: "Drupal\commerce_stripe\Plugin\Commerce\PaymentGateway\StripePaymentElement::processWebHook(): Argument #1 ($webhook_event_id) must be of type int, null given, called in /var/opt/www/[your site domain]/releases/58/web/modules/contrib/commerce_stripe/src/Plugin/Commerce/PaymentGateway/StripePaymentElement.php on line 586.
I have already read another issue ( #3420717 🐛 Webhook httpstatus 500 Fixed ), but I didn't quite understand what needs to be done to resolve it...
I tried introducing "skip_return_failure": true, where should I insert it?
Has the fix for #3420717 already been applied to commerce_stripe-8.x-1.2, or is it necessary to apply a workaround?
- Here is the request sent by Stripe to the Webhook ( requestBodyAnonymized.tx → t)

Payment method: Klarna

I reviewed the scenarios in Klarna's documentation without finding any issues (customer address, currency, order amount, ...)
I believe the problem lies with the configuration of the "Setup Future Usage" option set to "Single use", because I can't find where or how to configure this option. In short, on the requires_payment_method request, the "Setup Future Usage" option remains set to "On-session", and that's why I don't see Klarna.
Let me give you some information about the current configurations:

• Configuration of Checkout flows on Drupal ( 20241205_DrupalCheckoutflows.jpg → )
• Configuration of Payment Gateways on Drupal ( 20241205_DrupalPaymentGatewaysStripe.jpg → )
• Configuration of Payment Klarna on Stripe ( 20241205_Stripe-Settings-Payments_Klarna-Configuration.jpg → )
• The Overview screen of Webhooks (Test mode) on Stripe ( 20241205_Stripe-WebhooksOverview_TestMode.jpg → )

Can you help me further with this?
Thank you in advance!

I found the solution, very simple.
I'm really sorry, but I didn't realize that the latest version had not been installed due to an incompatibility with another module. I isolated the incompatibility and installed the latest version, everything works perfectly!