Fatal error: Uncaught Error: Interface "Inpsyde\Zettle\Auth\OAuth\Grant\GrantType" not found in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-auth/src/OAuth/Grant/JwtGrant.php:14 Stack trace: #0 {main} thrown in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-auth/src/OAuth/Grant/JwtGrant.php on line 14