Fatal error: Uncaught Error: Interface "Http\Client\Common\Plugin" not found in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-auth/src/HTTPlug/ZettleAuthPlugin.php:23 Stack trace: #0 {main} thrown in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-auth/src/HTTPlug/ZettleAuthPlugin.php on line 23