All Kustom merchants must update their API endpoints across all relevant environments by March 31, 2026. After this date, API calls to legacy Klarna endpoints will no longer be supported.
What's Changing
Your API endpoint domain is moving from klarna.com to kustom.co. The new endpoints are:
- Production:
api.kustom.co - Playground:
api.playground.kustom.co
⚠️ Important: The correct domain is
kustom.co— notkustom.com. Double-check this when updating your configuration.
How to Update Your API Endpoints
Step 1 — Add your new Kustom credentials
Log in to your backend system/configuration panel and add your new Kustom API credentials. Don't remove your existing Klarna credentials yet — wait until all endpoints have been updated and tested.
Step 2 — Update all API endpoint references
Search your codebase and configuration files for any references to klarna.com and replace them with the corresponding kustom.co endpoint. Common places to check include your environment/config files, backend API client code, hardcoded URLs in your checkout or payment logic, and webhook configuration settings.
Step 3 — Apply the change in all relevant environments
Make sure the update is applied everywhere you run the integration — production, playground/staging, and any other test or development environments.
Step 4 — Verify with a test purchase
Once all endpoints are updated, do a test purchase in each environment to confirm your checkout flow is working end-to-end. Select "KlarnaInStore" as payment provider.
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