If your integration is not working, first check:

Test mode is switched off
Klarna API credentials are entered in the correct place in your plug-in and there are no white/empty spaces before/after the credentials, if you have more than one set of API generated, disable them all and only enter the latest ones. (tip: download them on your laptop so you have password for easy reference)
You have the correct version of Klarna plug-in installed (KP (Klarna payment) or KCO (Klarna Checkout))
If you can’t see Klarna’s iframe, it might be due to:
Klarna’s plug-in not being activated
The page with terms and conditions is not linked
Another plug-in is disrupting Klarna’s plug-in
The design of your webshop, meaning your theme, is not compatible with Klarna plug-in

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