Fatal error: Uncaught Error: Class 'WC_Checkout' not found in /home/athpfkmy/public_html/resinpro.pl/wp-content/plugins/woocommerce-paypal-payments/modules/ppcp-button/src/Validation/CheckoutFormValidator.php:19 Stack trace: #0 {main} thrown in /home/athpfkmy/public_html/resinpro.pl/wp-content/plugins/woocommerce-paypal-payments/modules/ppcp-button/src/Validation/CheckoutFormValidator.php on line 19