Klarna Docs - Whitelisting

Whitelisting

In order to use the Klarna express button you need to activate the product by getting your Klarna Merchant ID (MID) whitelisted. The whitelisting process works as described:

To whitelist your Merchant ID for your website you need to provide your Klarna delivery manager with the MID you wish to whitelist and the domain(s) of your website e.g: https://www.klarna.com 

To whitelist your Merchant ID for your Android Application you need to provide your Klarna delivery manager with the MID you wish to whitelist and the Application ID from your app.

To whitelist your Merchant ID for your IOS Application you need to provide your Klarna delivery manager with the MID you wish to whitelist and the Bundle ID from your app.