I am trying to enable Payment module "Klarna Checkout", it uses API for sure. I checked the logs when I tried to activate it and it says:
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2017-11-06 9:31:39 - PHP Notice: Trying to get property of non-object in /home/admin/domains/gameffect.se/public_html/butik/catalog/controller/startup/session.php on line 10
2017-11-06 9:31:39 - PHP Notice: Undefined index: username in /home/admin/domains/gameffect.se/public_html/butik/catalog/controller/api/login.php on line 11