Clears the cart when a specific page is loaded (it can also add a product to the cart automatically)

clear_cart_when_loading_page.php

<?php

add_action( 'template_redirect', 'clear_cart_when_loading_page' );
function clear_cart_when_loading_page() {
  $page_id = 124;
	if ( is_page( $page_id ) ) {
		WC()->cart->empty_cart(); 
    // Uncomment the next lines if you want to add a product to the cart automatically
    // $product_id = 1098;
		// WC()->cart->add_to_cart( $product_id );
	}
}