Overview
Kustom is switching to its own independent infrastructure to provide you with better reliability, faster development, and new features.
To continue using Kustom's API, you must update your API credentials and switch to Kustom's new endpoints before March 31, 2026.
This guide will walk you through the switch process step by step.
What you need to do
Important dates
Deadline: March 31, 2026
What happens if you don't switch: Your API connection will stop working, which may disable your checkout
Downtime: No downtime if you follow the switch steps correctly
What stays the same
Good news! Most things remain unchanged:
API endpoints, parameters, and logic are identical to Klarna's setup
No changes to your checkout or settlement processes
No changes to payout schedules or report formats
Customer experience remains exactly the same
Only the base URL and credentials change
Testing your switch (optional)
Testing your switch (optional)
If you want to, before going live with the new API credentials, you can test your integration to ensure everything works correctly:
Test in the Playground environment first using
https://api.playground.kustom.coComplete a test purchase to verify your checkout flow
If you don't have a test environment, switch during low-traffic hours and verify that checkout loads normally.
If you have multiple stores or merchant IDs, create new credentials for each one
Managing your credentials
Managing your credentials
Storing credentials securely
Your API credentials provide full access to checkout, order management, and settlements. Store them securely and never share them publicly.
Rotating or revoking credentials
To rotate or revoke credentials:
Log in to the Kustom Portal
Go to Integrations
Generate new credentials or delete old ones
Legacy Klarna credentials
You can keep your Klarna credentials temporarily to handle legacy orders or access historical data through Klarna's Merchant Portal.
sFTP credentials
If you need new sFTP credentials, this will soon be available to generate in the Kustom Portal.
Whitelisted IP addresses
If you whitelist Kustom's IP addresses, they remain the same for both environments:
Production:
63.34.181.121
34.252.11.205
54.72.22.140
Playground:
54.75.162.237
99.80.156.64
99.80.3.148
If you use a platform integration
If you use a platform integration
If you use a platform like MyStore, Quickbutik, or WooCommerce (Krokedil):
Kustom will coordinate directly with your platform to handle the endpoint updates
You'll be notified when your platform's integration is ready
You may still need to generate new credentials in the Kustom Portal
For more information, see:
Settlements and historical data
Settlements and historical data
Your payout schedules and settlement processes remain unchanged
Historical data remains accessible through Klarna's Merchant Portal and Klarna's sFTP
For orders created before the switch, process refunds through Klarna's Merchant Portal
Need help?
If you have questions or need assistance with the switch:
Email: support@kustom.co
Documentation: API URLs Documentation
We're here to help make your switch as smooth as possible!