This guide helps you switch from Klarna’s API to Kustom’s infrastructure. The process involves updating your credentials and endpoint URLs to ensure a smooth transition to our independent platform.
Why this switch matters
Kustom is moving all API traffic to its own infrastructure to deliver better service availability, faster performance, and direct access to new features. Switching also ensures stronger security and support directly from Kustom’s technical teams.
Switch deadline
All merchants must complete the switch by March 31, 2026.
After this date, API calls made to Klarna endpoints will no longer work, and your integration may experience service disruptions.
What’s changing
Two main updates are required for your integration:
Replace Klarna endpoint URLs (
*.klarna.com) with Kustom endpoints (*.kustom.co).Generate new Kustom API credentials to replace your existing Klarna ones.
This affects the following Kustom services: Checkout API, Order Management API, Settlement API, Hosted Payment Page API, and sFTP-based settlement files (which require separate credentials).
How to switch
How to switch
1. Generate new Kustom credentials
Log in to portal.kustom.co and create new API credentials for each environment.
Production:
Go to Integrations in the left sidebar.
Select your store and click
Generate newSave credentials (since they are only visible once)
Playground (optional):
Use portal.playground.kustom.co and repeat the same steps to generate test credentials.
2. Update your code / configuration with the new credentials
Update your code or configuration to point to Kustom’s infrastructure:
Endpoints: Replace all instances of
klarna.comwithkustom.co
(Note: the domain ends with .co, not .com.)
Credentials: Use the Kustom credentials you generated in the previous step.
Base URLs:
Production –
api.kustom.coPlayground –
api.playground.kustom.co
3. Test your setup (optional)
Before deploying, test thoroughly in the Playground environment:
Confirm that all API calls succeed.
Run a complete test purchase and check order management operations.
Verify that settlement data is received as expected.
4. Go live
After testing, deploy your updates to production.
Monitor initial transactions closely and confirm that all services are functioning normally.
Where to Find Technical Details
Visit docs.kustom.co for:
Complete API documentation
Authentication guides
Code examples and SDKs
Switch-specific notes
Need Help?
We’re here to support you throughout the switch:
Technical Support: support@kustom.co
FAQ
FAQ
Will my old credentials stop working immediately?
No. They remain active until March 31, 2026, but switching early prevents service issues.
Can I switch environments separately?
Yes. Start with the Playground environment if applicable, then switch Production when ready.
Will customers notice the switch?
No changes should be visible to customers.
Can I keep old and new credentials active temporarily?
Yes, but old credentials will be deactivated after the deadline.
What happens if I miss the deadline?
Your API calls will fail, disrupting checkout and order management functions.
Final reminders
Security: Store credentials securely — never share or commit them to version control.
Timeline: Begin early to leave time for testing.
Communication: Inform your tech team and stakeholders about switch timelines and updates.