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// Enable add-to-cart by SKU support add_filter('woocommerce_add_to_cart_product_id', function($product_id){ if(!$product_id && isset($_REQUEST['add-to-cart'])){ $sku = sanitize_text_field($_REQUEST['add-to-cart']); if(!ctype_digit($sku)){ $id = wc_get_product_id_by_sku($sku); if($id) return $id; } } return $product_id; }, 10, 1);