Add URL field

includes/class-wc-structured-data.php

@@ -200,6 +200,7 @@ class WC_Structured_Data {
 			'@type'       => 'Product',
 			'@id'         => $permalink . '#product', // Append '#product' to differentiate between this @id and the @id generated for the Breadcrumblist.
 			'name'        => $product->get_name(),
+			'url'         => $permalink,
 			'image'       => wp_get_attachment_url( $product->get_image_id() ),
 			'description' => wp_strip_all_tags( do_shortcode( $product->get_short_description() ? $product->get_short_description() : $product->get_description() ) ),
 		);