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Troubleshooting

Introduction

If you are looking for documentation regarding Klarna Payments, you can find it here.

Since of version 2.0.0 of the KCO plugin, the WooCommerce order will now be created first (in Pending status), then the Klarna order is placed, and finally the WooCommerce order is updated to Processing status. This update is more compatible with other WooCommerce plugins.

The new checkout flow also means that Pending orders can be visible in WooCommerce, where the payment has not been finalized in Klarna (for example card payment where there was not enough funds on the card). This is part of the general WooCommerce checkout flow, and it does not implicate that something is wrong. It is just a new scenario for the Klarna Checkout payment gateway. Read more about the checkout flow rewrite here.

Klarna Checkout for WooCommerce is a plugin that extends WooCommerce, allowing you to take payments via Klarna.

Klarna Checkout is available in 170+ countries with more than 10 countries which are Klarna core countries.
The current offered core countries in combination with their local currencies
You need an agreement with Klarna to be able to use this plugin.
A SSL Certificate is required.
Klarna Checkout for WooCommerce support High-Performance Order Storage (HPOS).

Klarna Checkout does not support the Checkout block i WooCommerce.
You can read more about this here.

Order management
Read more about how to manage Klarna orders directly from WooCommerce.
Klarna Checkout Hooks: Actions & Filters
Read more about available hooks in the Klarna Checkout plugin.
Recurring payments
Klarna Checkout supports recurring payments via the WooCommerce Subscriptions plugin. Here is a guide to help you get started.

Required WordPress/WooCommerce Settings

Make sure that you have enabled pretty permalinks in your WordPress installation. Otherwise callbacks from Klarna back to your store won’t work and orders will not be updated with the correct order status/information.
It is recommended to enable guest checkout (Enable guest checkout setting in WooCommerce > Settings > Payments).
To get the order total to match between WooCommerce and Klarna you need to configure WooCommerce to display prices with 2 decimals. More information about displaying of prices and how it can cause rounding issues can be found in this article.
You need to specify a terms page in WooCommerce’s Settings.
Do not cache the cart and checkout pages as this can cause problems. Issues might be, but are not limited to, wrong prices showing, order numbers getting mixed up or even that one customer can see another customers information.
The cart and checkout pages are dynamic pages and if you cache these they will not be dynamic anymore, which can result in the problems above. You can read more about caching and optimization here.
A valid SSL Certificate
Your checkout page must use the Classic Shortcode block. Klarna Checkout does not support the Checkout block at this point. You can read more about this here.

Required Klarna settings

You must have Klarna Checkout Global activated in your Klarna account. Otherwise customers from other countries than the store base country will see a Bad value: purchase_currency error message instead of the KCO iframe in the checkout.

More documentation on KCO Global.

Configuration

Before you get started you need to make sure you are using the Classic Shortcode block on your set Checkout Page.
The Checkout block is the default for new WooCommerce installations as of version 8.3. Klarna Checkout for WooCommerce does not yet support this.

Go to Pages → your set Checkout Page and transform the Checkout block to the Classic Shortcode block.

Basic settings

Go to: WooCommerce → Settings → Payment → Klarna Checkout.
Enable Klarna Checkout by checking the Enable Klarna Checkout checkbox.
Title – Enter the title for the payment method displayed in the checkout and order confirmation emails.
Description – Enter the description of the payment method displayed in the checkout page.
Other payment method button text – Customize the Select another payment method button text that is displayed in checkout if using other payment methods than Klarna Checkout. Leave blank to use the default (and translatable) text.
Add Klarna Post Purchase info to order email – This will add Klarnas Post Purchase information to the order emails that are sent. You can read more about this here: Klarna Docs: Post-purchase experiece
Test mode – check the Enable Test Mode checkbox to place the payment gateway in test mode using test API keys
Logging – check the Log debug messages to save debug messages to the WooCommerce System Status log
Checkout layout – select the Checkout layout. Choose between One column checkout, Two column checkout (Klarna Checkout in right column), Two column checkout (Klarna Checkout in left column) and Two column checkout (Klarna Checkout in left column) – Storefront light

API Credentials Europe / United States

Based on your store base location and the countries you are selling to, you will use one of these sections. By adding merchant credentials to a specific region (Europe or the United States) you also enable Klarna Checkout as an available payment method for that region. Note that you need an agreement with Klarna for each region enabled.

Production Klarna API Username – Where you enter the API Username received in the Klarna Merchant Portal.
Production Klarna API Password – Where you enter the API Password received in the Klarna Merchant Portal.
Test Klarna API Username – Where you enter the API Test Username received in the Klarna Merchant Portal (if you have applied for a test account).
Test Klarna API Password – Where you enter the API Test Password received in the Klarna Merchant Portal (if you have applied for a test account).

Shipping settings

Separate shipping address – Tick this checkbox if you want to allow customers to use a shipping address that is not the same as their billing address.
Shipping methods in iframe – If this option is checked, selection of shipping method is done in Klara iframe. Shipping price and name of the selected shipping method will be displayed in WooCommerce order review.
This option should not be checked if you use a shipping plugin with additional shipping options for the customer – see Troubleshooting Shipping Methods in iframe
Shipping details – Enter any additional shipping information you wish to be displayed to customers in Klarna Checkout iframe after they have placed an order.

Checkout settings

Product URLs – Tick the checkbox if you want to send product and product image URLs to Klarna.
Date of birth mandatory – Tick this checkbox if you want to make it mandatory for customers to enter their date of birth during checkout.
National identification number mandatory – If this is checked the customer have to complete a validation process for the national identification number (SE, NO, FI and DK only).
Checkout privacy policy text – Choose if, or where, the Checkout privacy policy text should be displayed
Terms and conditions checkbox – Add a terms and conditions checkbox inside Klarna checkout iframe
Allowed Customer Types – Choose if your store is Business to Consumer (B2C) or Business to Business (B2B), or both.
Title mandatory (GB) – Check this to make customer’s title mandatory, only works for customers based in GB.
Show prefill consent notice – Check this to prevent logged-in customers’ data from being sent to Klarna, only applicable for customers from Germany and Austria.
Display quantity fields – Check this option if you want your customers to be able to change the number of products on the Checkout page in the same way as they would in the cart.
Display subtotal details – Select how you want to show the subtotal details on the checkout page. Choose between In the WooCommerce order review, In the Klarna Checkout iFrame or In Both.

Color settings

With the Color settings section, you have the possibility to alter the appearance of the Klarna Checkout iframe displayed in the checkout. Here you can change things like background colors, button colors and text colors.

Checkout flow setting

You can use the filter below to enable an additional setting for Checkout flow.

add_filter('kco_enable_redirected_flow', '__return_true');

When activated the Checkout flow setting will appear below the Checkout layout setting (see Configuration) with the following options:

Embedded – The checkout is embedded in the WooCommerce checkout page and partially replace the checkout form.
Redirect – The customer is redirected to a payment page hosted by Klarna.

You can add the filter through the Code Snippets plugin, or something similar of your choice.

Set up Klarna Checkout for test purchases

Find your test credentials and set up your WooCommerce store for test purchases:

Sign up for a Playground (test) environment at Klarna, or log in if you already have signed up for this, at the Klarna Merchant Portal.
Go to Settings and click on Generate new Klarna API credentials
Save or download your keys
Go to the Klarna Checkout settings in WooCommerce.
Enable the Test Mode and make sure that you also Log debug messages.
Enter your test Username and Password.
Save the settings.

Make a test purchase

In your shop Checkout you should now see a green “Test drive” banner, confirming that you are in test mode.

You can now make test purchases using the sample data from Klarna.

B2B – Specify tax on invoices

Klarna has an add-on B2B service for invoices with specified tax for Swedish merchants.

For this service to work the tax needs to be specified in the "create_order" call and the order has to be activated per orderline.

This is already handled in our plugin, so you as a merchant just need to activate this service with Klarna.

Contact your regions Merchant Support at Klarna.

Make sure that you do not have Force capture full order activated in the Klarna Order Management settings.
If this setting is active, the plugin will ignore sending the specific order lines to Klarna and only send the full amount. This will cause the B2B Tax feature to not work as it should.

Subscription support

Klarna Checkout is compatible with the WooCommerce Subscriptions extension for handling of recurring payments.

Please note that Klarna supports subscriptions only for some regions. Please check with Klarna merchant support for supported regions.

Multi currency support

Klarna Checkout can be used with the following currencies: AUD, CAD, CHF, DKK, EUR, GBP, NOK, SEK, USD. The currency accepted by Klarna Checkout is dependent on your site and your specific agreement with Klarna. For every new currency you want to add to your store, you both need a separate agreement with Klarna and add the new currency to your store via a separate multi currency plugin.

To avoid any issues related to currencies we strongly recommend that you activate KCO Global for each currency you offer in your store. Read more about KCO Global here.

Before you Go Live

When the installation is done and you are ready to go live you need to contact Klarna integration support. Klarna will then verify the integration before the shop goes live.
Klarna Checkout should be the first/default payment method (if multiple payment methods are active). This can be adjusted in the section Payment methods in → WooCommerce → Settings → Payments.
The Klarna logotype should be visible on the website (for example in the footer). More info and logos can be found here.

Files to exclude from optimization

If you are using some kind of optimization feature there are files that needs to be excluded from any caching or concatenating.

For Klarna Checkout for WooCommerce you need to exclude the following files:

wp-content/plugins/klarna-checkout-for-woocommerce/assets/js/klarna-checkout-for-woocommerce.min.js
wp-content/plugins/klarna-checkout-for-woocommerce/assets/js/klarna-checkout-for-woocommerce.js
Files from https://js.playground.klarna.com
Files from https://js.klarna.com
Files from cdn.klarna.com

Compatibility with themes & plugins

Klarna Checkout uses its own template file for displaying the checkout page and should work with most themes. However, the plugin is only tested with the Storefront theme and we do not guarantee that it will work with other themes. Common situations when errors occur are:
– Themes/plugins with customized template files for WooCommerce checkout page.
– Themes/plugins that modifies the checkout into a multi step checkout.
The plugin and Klarna only handle product quantity that is specified as an integer. For instance you can’t send 1.5 as the product quantity to Klarna. If you sell products where you charge by length or dimension we recommend that you use the Measurement Price Calculator plugin.

Read more about compatibility on these links:
Klarna Checkout – Compatible plugins
Klarna Checkout – Known compatibility issues

Krokedil and Klarna do not offer help with adapting your theme or plugin within regular support.