Apply for API credentials

In order to integrate and send requests to any of Klarna's APIs, you will need a set of credentials. These credentials are comprised of two elements:

  • Username - A combination of your Merchant ID (a unique number that identifies your e-store) and a random string. 
  • Password - a string which is associated with your Merchant ID and is used to authorize use of Klarna's APIs


A merchant has been assigned the Merchant ID: A100001. The merchant's Username and password to be used to authenticating API requests could then be 

  • Username: A100001_1b818918f9db
  • Password: rPvw912p34CkdLo4


Note: The API credentials are separate from your Merchant ID, and it is possible to have several API credentials associated with the same Merchant ID.
Note: It might take up to one day for us to create the required credentials for you.  

If you have questions or want to sign up with Klarna, please use the contact form here and we'll get back to you shortly!