Generate coupon once

functions.php

<?php

add_action('init', 'generate_coupon_manually');

function generate_coupon_manually() {
    if (isset($_GET['generate_once']) && $_GET['generate_once'] == 'true') {
        // Check if admin
        if (!current_user_can('manage_options')) {
            wp_die('You do not have permission to access this page.');
        }

        // Hardcode the order ID here
        $order_id = 123; // Replace with your actual order ID

        // Check if coupon has already been generated
        $order = wc_get_order($order_id);
        if ($order->get_meta('_raf_coupon_generated', true)) {
            wp_die('Coupon has already been generated for this order.');
        }

        // Generate coupon
        $referral_id = WPGENS_RAF_Order::get_referral_id($order_id);
        if (!$referral_id) {
            wp_die('Invalid referral ID.');
        }

        $coupon_object = new WPGens_RAF_Coupons('referrer', $referral_id, $order_id);
        $coupon_code = $coupon_object->get_coupon();

        if ($coupon_code) {
            // Email Coupon Code
            if (!WPGENS_RAF_Order::settings_field_active('gens_raf_disable_emails')) {
                $email = new WPGens_RAF_Email($coupon_object->coupon_mail, $coupon_code, $order_id);
                $email->send_email();
            }

            // Mark as generated
            $order->update_meta_data('_raf_coupon_generated', true);
            $order->save();

            echo "Coupon generated successfully: " . $coupon_code;
        } else {
            echo "Failed to generate coupon.";
        }

        exit;
    }
}