Fatal error: Uncaught Error: Interface "Inpsyde\Zettle\Webhooks\Rest\Verifier" not found in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-webhooks/src/Rest/SignatureVerifier.php:16 Stack trace: #0 {main} thrown in /var/www/html1/wp-content/plugins/zettle-pos-integration/modules/zettle-webhooks/src/Rest/SignatureVerifier.php on line 16