Fatal error: Uncaught Error: Interface 'SellingPartnerApi\Contract\AuthorizationSignerContract' not found in /Applications/XAMPP/xamppfiles/htdocs/Project_April/selling-partner-api-main/lib/AuthorizationSigner.php:8 Stack trace: #0 {main} thrown in /Applications/XAMPP/xamppfiles/htdocs/Project_April/selling-partner-api-main/lib/AuthorizationSigner.php on line 8