Answers for "change product price in woocommerce order"

how to get woocommerce product price

$_product->get_regular_price();
$_product->get_sale_price();
$_product->get_price();

woocommerce order item get product id

foreach ( $items as $item ) {
    $product_name = $item->get_name();
    $product_id = $item->get_product_id();
    $product_variation_id = $item->get_variation_id();
}