Fatal error: Uncaught Error: Interface "Inpsyde\Zettle\PhpSdk\DAL\Entity\Variant\VariantTransferInterface" not found in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-php-sdk/src/DAL/Entity/Variant/Variant.php:19 Stack trace: #0 {main} thrown in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-php-sdk/src/DAL/Entity/Variant/Variant.php on line 19