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Welcome to our Help Center!

Get started offering Klarna through Billwerk

Klarna Bank AB, commonly referred to as Klarna, is a Swedish fintech company that provides online financial services such as payments for online storefronts and direct payments along with post-purchase payments.

This article shows you

How to get an agreement with Klarna

In order to get an agreement with Klarna, contact via their website and indicate your company details below. The Klarna Team will respond to you from there.

  • Annual Sales Volume

  • First Name

  • Last Name

  • Email

  • Phone

  • Website

  • What do you sell?

  • Average Order Value

  • E-commerce platform

  • Instagram Account Name

You can advantageously say that you use Billwerk+ as a Payment Gateway.

For your agreement to be accepted, the following details must be visible on your webshop :

  • Organisation number – please note that the organisation number specified on the webshop must match the one registered with Klarna

  • Registered company name

  • Registered company address

  • Prices on the products including transaction currency

  • Product description

  • Terms and conditions

  • Your contact details including an email address

  • Return policy including 14 days return rights

  • Shipping policy. If shipping costs are added, the amount needs to be specified

  • Estimated delivery time


  • Your URL must be live

  • Your URL must not redirect to another website

  • All links on the webshop must work, no error messages should appear

Klarna API credentials

Now let us see, how you find your credentials.

  1. First login to your Klarna account here.

  2. Navigate to Indstillinger or Settings.

  3. You should be redirected directly to your Klarna API-user page. If not chose the page in the menu.

  4. Now click Create new Klarna API-user.

  5. You will now see your API username (UID) and password.


    Ensure to save them on your computer or download the .txt file.

  6. Very good, now we will see how to use them in your Billwerk+ Payment App.

Setup Klarna Pay Later or Klarna Slice it
  1. Return into the Billwerk+ Pay App.

  2. Looking at the sidebar navigation on the left side of your screen, under Configuration Reepay_navigation_icon.png Payment Methods you will find Payment Methods.

  3. Scroll to Instalments.

  4. Select either Klarna Pay Later or Klarna Slice it.

  5. Insert your API username (UID) and password.

  6. Click on Create.

Good job! Now your clients can select Klarna Slice it or Klarna Pay Later in the Check out.