Loop through WooCommerce order products

functions.php

<?php

$count = 1;
foreach( $order->get_items() as $item_id => $line_item ){
    $item_data = $line_item->get_data();
    $product = $line_item->get_product();
    $product_name = $product->get_name();
    $item_quantity = $line_item->get_quantity();
    $item_total = $line_item->get_total();
    $metadata['Line Item '.$count] = 'Product name: '.$product_name.' | Quantity: '.$item_quantity.' | Item total: '. number_format( $item_total, 2 );
    $count += 1;
}

return $metadata;