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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);
