Order Object

// Get $product object from $order / $order_id
$order = new WC_Order( $order_id );
$items = $order->get_items();
foreach ( $items as $item ) {
    $product = wc_get_product( $item['product_id'] );
    // Now you have access to (see above)...
    // etc.
    // etc.

Author: Wojciech Borowicz

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