Fatal error: Uncaught Error: Class "WC_Settings_API" not found in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-settings/src/WC/ZettleIntegration.php:14 Stack trace: #0 {main} thrown in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-settings/src/WC/ZettleIntegration.php on line 14