Shopware 5 Klarna API Sunset: Is Your Store Ready for the Kustom.co Migration?

Shopware 5 Klarna API Sunset: Is Your Store Ready for the Kustom.co Migration?

If you're running a Shopware 5 store and rely on Klarna Checkout, a critical update is looming. Klarna, now operating as Kustom.co, is requiring all merchants to migrate their API integration from Klarna.com to Kustom.co by March 31st, 2026. Failing to do so will result in a disruption of your Klarna payment processing, potentially impacting sales and customer satisfaction.

This change stems from an infrastructure update on Klarna's side, now reflected under the Kustom.co brand. While seemingly a minor technical adjustment, it necessitates a code modification within your Shopware 5 Klarna plugin. This blog post will guide you through understanding the issue, identifying the affected plugin, and exploring potential solutions to ensure a seamless transition.

The Impending Deadline: March 31st, 2026

The deadline is non-negotiable. After March 31st, 2026, the old Klarna.com API endpoint will be decommissioned. Any Shopware 5 store still using the old API will no longer be able to process Klarna payments. This could lead to abandoned carts, frustrated customers, and a significant drop in revenue.

Identifying the Affected Shopware 5 Klarna Plugin

Many Shopware 5 merchants are using plugins to integrate Klarna Checkout into their stores. One plugin mentioned in the Shopware forum discussion is the "Klarna Checkout für Shopware 5" plugin, version 1.5.3. This plugin was reportedly initially maintained by BestIT, but they are no longer offering support or updates. Another company, 426 GMBH, may have been involved in the plugin's development, as suggested by documentation found on klarna-shopware.426-upgrade.com.

To determine if your store is affected, you need to identify which Klarna plugin you are using and check its configuration. Look for the API endpoint setting. If it points to Klarna.com, you need to take action.

Steps to Take Before March 31st, 2026

1. Identify Your Klarna Plugin: Log in to your Shopware 5 backend and navigate to the plugin manager. Locate your Klarna plugin and note its name and version number.
2. Check the API Endpoint: Access the plugin's configuration settings. Look for a field related to the API endpoint or URL. If it's set to Klarna.com, you need to update it.
3. Contact the Plugin Developer (If Possible): If the plugin is still actively maintained, contact the developer for an updated version that supports the Kustom.co API.
4. Explore Alternative Solutions: If the original developer is unresponsive or no longer supports the plugin, you have several options:
   • Custom Development: Hire a Shopware developer to modify the plugin code to use the new Kustom.co API. This is the most flexible option but also potentially the most expensive.
   • New Plugin: Consider switching to a different Klarna plugin that is actively maintained and supports the Kustom.co API. Ensure the new plugin is compatible with your Shopware 5 version and offers the features you need.
   • SafeFive: As suggested in the forum, SafeFive (safefive.de) might offer solutions or support for migrating your Klarna integration. Contact them to inquire about their services.
5. Test Thoroughly: After implementing any changes, thoroughly test the Klarna Checkout process to ensure it's working correctly. Place test orders and verify that payments are processed successfully.

Code Modification Example (Illustrative)

While the specific code modification will depend on the plugin's structure, the core change involves updating the API endpoint URL. Here's a simplified example:

// Old API Endpoint
$api_url = 'https://api.klarna.com/...';

// New API Endpoint
$api_url = 'https://api.kustom.co/...';

Important: This is a simplified example. Modifying plugin code requires technical expertise. If you're not comfortable with PHP and Shopware development, seek professional assistance.

The Importance of Proactive Action

Don't wait until the last minute to address this issue. The March 31st, 2026 deadline will arrive quickly. Proactive planning and execution are crucial to avoid payment disruptions and ensure a smooth transition for your Shopware 5 store. By taking the necessary steps now, you can maintain a seamless checkout experience for your customers and protect your revenue stream.

Remember to always back up your Shopware 5 store before making any changes to plugins or code. If you're unsure about any of the steps outlined above, consult with a qualified Shopware developer or migration expert.