thank you hook

<?php

namespace Kamal\Jom;

class GeneratePDF {
    public function __construct() {
        add_action( 'woocommerce_thankyou', 'get_order_data', 10, 1 );
    }

    public function get_order_data( $order_id ) {

        if ( !$order_id ) {
            return;
        }

        // Getting an instance of the order object
        $order = wc_get_order( $order_id );

        if ( $order->is_paid() ) {
            $paid = 'yes';
        } else {
            $paid = 'no';
        }

        // iterating through each order items (getting product ID and the product object)
        // (work for simple and variable products)
        foreach ( $order->get_items() as $item_id => $item ) {

            if ( $item['variation_id'] > 0 ) {
                $product_id = $item['variation_id']; // variable product
            } else {
                $product_id = $item['product_id']; // simple product
            }

            // Get the product object
            $product = wc_get_product( $product_id );

        }
        print_r( $order );

        // Ouptput some data
        echo '<p>Order ID: ' . $order_id . ' — Order Status: ' . $order->get_status() . ' — Order is paid: ' . $paid . '</p>';
    }

}