Fatal error: Uncaught Error: Class 'PayPalCheckoutSdk\Core\PayPalEnvironment' not found in /var/www/html/RIE/vendor/paypal/paypal-checkout-sdk/lib/PayPalCheckoutSdk/Core/SandboxEnvironment.php:5 Stack trace: #0 {main} thrown in /var/www/html/RIE/vendor/paypal/paypal-checkout-sdk/lib/PayPalCheckoutSdk/Core/SandboxEnvironment.php on line 5