Fatal error: Uncaught Error: Interface "Inpsyde\Zettle\Provider" not found in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-php-sdk/src/Provider/BootstrapProvider.php:11 Stack trace: #0 {main} thrown in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-php-sdk/src/Provider/BootstrapProvider.php on line 11