Klarna Deprecates Legacy Web SDK: What Magento Merchants Need to Know
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Klarna Deprecates Legacy Web SDK: What Magento Merchants Need to Know

ByKiwi Commerce

Klarna has officially deprecated its legacy Web SDK, a move that directly impacts Magento merchants using Klarna’s On-Site Messaging (OSM) to display financing options and promotional banners. This change is part of Klarna’s broader strategy to improve performance, enhance security, and ensure regulatory compliance across its integrations.

In this article, we explain why Klarna has retired the Web SDK, how it affects your Magento store, and what steps you should take to migrate to the new version.

Why Klarna Retired the Legacy Web SDK

The decision to deprecate the legacy SDK was driven by growing limitations in its functionality, performance, and compliance. The key issues included:

  • Limited Customisation: Outdated and inflexible styling and placement options.
  • Performance Challenges: Legacy scripts slowed down page load times and could cause rendering issues.
  • Privacy Compliance Risks: The SDK lacked support for modern GDPR and cookie consent frameworks.
  • Poor Mobile Adaptability: The old integration did not perform well on responsive or mobile-first layouts.
  • End of Support: Klarna will end support for the legacy SDK by the end of 2024.

Merchants continuing to use the outdated SDK may experience broken functionality and face compliance issues, particularly with data protection regulations.

Benefits of the New Klarna On-Site Messaging SDK

Klarna’s updated SDK (version 5 and above) is a complete rebuild, offering improved flexibility, better performance, and full compliance with current privacy standards. Key benefits include:

  • Faster Load Times: Asynchronous loading minimises impact on site performance.
  • Responsive Design: Fully supports mobile and tablet devices with modern layouts.
  • Simplified Integration: Uses declarative HTML attributes such as data-key and data-purchase-amount.
  • GDPR Compatibility: Easily integrates with consent management platforms to respect user privacy preferences.
  • Advanced Reporting: Enables more accurate tracking of impressions and customer engagement.

The new SDK is now the standard across all Klarna On-Site Messaging implementations and is actively supported by Klarna’s technical team.

How Magento Merchants Are Affected

If your Magento store still relies on Klarna’s legacy Web SDK, the following issues may arise:

  • Klarna promotional messages may not render correctly across product, basket, and checkout pages.
  • Without proper consent integration, your site may fall short of GDPR compliance.
  • New Klarna features and updates will not be available without the latest SDK.
  • Existing Klarna Magento modules using the legacy SDK will become obsolete and may stop functioning.

To continue offering a compliant and seamless Klarna experience, Magento stores must update to a supported version of the Klarna module.

How to Migrate to the New Klarna SDK on Magento

Migrating to the latest SDK is a straightforward process when handled correctly. Follow the steps below to ensure a successful transition:

Step 1: Update the Klarna Magento Module

Update to the latest Klarna On-Site Messaging module using Composer:

composer require klarna/module-onsitemessaging
bin/magento setup:upgrade
bin/magento cache:flush

This ensures your store is using the newest version of the Klarna module that supports SDK version 5 and above.

Step 2: Verify Messaging and Cookie Consent Integration

After updating the module:

  • Confirm that Klarna messages appear correctly on all relevant pages.
  • Use the Klarna Merchant Portal to verify tracking and impressions.
  • Ensure cookie consent mechanisms block Klarna scripts until user consent is granted.
  • If you use a custom Magento frontend, your developers may need to adjust templates to accommodate the new markup structure.

Need Help with Klarna SDK Migration?

While the migration process is relatively simple, Magento merchants may require development support to:

  • Update custom templates or themes
  • Configure cookie consent tools for GDPR compliance
  • Validate performance and message rendering across devices
  • Audit existing Klarna integrations for compatibility

The team at KiwiCommerce offers expert assistance with Klarna SDK migrations, GDPR validation, and Magento module updates. We help ensure your store remains compliant, high-performing, and ready for future Klarna enhancements.

Conclusion

Klarna’s retirement of the legacy Web SDK marks an important transition for Magento merchants. Updating to the latest Klarna On-Site Messaging SDK is essential to maintain functionality, compliance, and access to new features.

We strongly recommend upgrading your integration well before the end-of-2024 support deadline to avoid potential disruptions.

If you are unsure whether your Magento store is using the outdated SDK, or need support implementing the new one, contact the KiwiCommerce team for a consultation.

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