Fatal error: Uncaught Error: Interface 'Klarna\Rest\Transport\UserAgentInterface' not found in /users/maximus/www/storage/vendor/klarna/kco_rest/src/Klarna/Rest/Transport/UserAgent.php:27 Stack trace: #0 {main} thrown in /users/maximus/www/storage/vendor/klarna/kco_rest/src/Klarna/Rest/Transport/UserAgent.php on line 27