---
title: "Switch from Klarna API to Kustom API (Klarna Checkout V3)"
url: "https://support.acendy.com/en/article/switch-from-klarna-api-to-kustom-api-klarna-checkout-v3"
language: "en"
last_updated: "2026-03-03T13:41:01.445Z"
---

# Switch from Klarna API to Kustom API (Klarna Checkout V3)

This article explains how to switch from the Klarna API and update to the Kustom API.

This does **not** happen automatically. You must generate new API keys in Kustom and add them to Mystore yourself.

## What Does the Message in Kustom Portal Mean?

If you see the message:

> *Some services are still using Klarna endpoints. Follow this guide to switch your setup to Kustom.*

it means that your online store is still using the old Klarna API endpoints (`api.klarna.com`).

You must:

-   Generate a new API key in Kustom
-   Add it to Klarna Checkout V3 in Mystore
-   Delete the old Klarna API key in Kustom Portal

* * *

## How to Switch – Step by Step

### Step 1: Generate a New API Key in Kustom

Follow these steps (based on Kustom’s Help Center):

1.  Go to **Kustom Portal** and sign in.
2.  Click **Integrations** in the left-hand menu.
3.  Click **Generate new**.
4.  Wait while the key is created.

Once the key has been generated:

-   Copy the **Kustom ID (username)**
-   Copy the **Kustom Secret (password)**
-   Store them in a secure location

**Important:**

*The Secret is* ***only displayed once****. If you lose it, you must generate a new API key.*

* * *

## Step 2: Add the API Keys in Mystore

1.  Go to **Extensions → Your extensions**
2.  Open **Klarna Checkout V3**
3.  Click **Credentials**
4.  Enter:
5.  -   Kustom ID
    -   Kustom Secret
6.  Click **Update ID and Secret**

* * *

## Step 3: Delete the Old Klarna API Key

1.  Go back to **Kustom Portal → Integrations**
2.  Locate the old key (pointing to `api.klarna.com`)
3.  Click the three dots
4.  Select **Delete API key**

* * *

## How to Confirm the Update Is Correct

In Kustom Portal, you should no longer see:

-   `api.klarna.com`

You should only use:

-   `api.kustom.co`

The “Action required” message will disappear once the setup is correctly updated.

* * *

## Important to Know

-   This is not done automatically
-   You must use **Klarna Checkout V3**
-   If you do not update before the deadline, payments may stop working
-   If you have multiple API keys, ensure you update the correct integration

* * *

## Troubleshooting

### “Integrations” Is Not Visible in the Portal

You likely do not have sufficient permissions.

**Solution:**

-   Contact your account administrator
-   Request access via **User Manager**

* * *

### I Lost the Secret Key

You must:

1.  Delete the existing key
2.  Generate a new API key
3.  Add it again in Mystore

* * *

### What If This Does Not Solve the Issue?

-   Verify that the correct ID and Secret have been entered
-   Confirm that you are using Klarna Checkout V3
-   Test a new order in your online store
-   Contact Mystore support and include:
-   -   A screenshot from Kustom Portal
    -   A screenshot of the settings in Klarna Checkout V3