save UTM params

functions.php

<?php

function save_source_tracker_meta($order_id)
{
    $disabled = get_option('wpgens_st_disable');

    if ($disabled) {
        return;
    }

    $last_touch = isset($_COOKIE['wpg_last']) ? json_decode(stripslashes($_COOKIE['wpg_last']), true) : null;
    $first_touch = isset($_COOKIE['wpg_first']) ? json_decode(stripslashes($_COOKIE['wpg_first']), true) : null;
    $unique_id = isset($_COOKIE['wpg_id']) ? sanitize_text_field($_COOKIE['wpg_id']) : null;

    if (!$last_touch && !$first_touch) {
        return;
    }

    $data_to_save = WPGens_ST\Includes\WPGens_ST_Config::getDataToSave();

    $order = wc_get_order($order_id);

    if ($unique_id) {
        $order->update_meta_data('_wpg_id', $unique_id);
    }

    if ($last_touch) {
        $last_touch = $this->sanitize_array($last_touch);
        $order->update_meta_data('wpg_last', $last_touch);
        foreach ($data_to_save as $key) {
            if (isset($last_touch[$key]) && $last_touch[$key] !== '') {
                $order->update_meta_data('_wpg_last_' . $key, $last_touch[$key]);
            }
        }

        // Extract and save click identifiers from the URL
        if (isset($last_touch['url'])) {
            $url_components = parse_url($last_touch['url']);
            if (isset($url_components['query'])) {
                parse_str($url_components['query'], $params);
                $click_ids = ['gclid', 'fbclid', 'msclkid'];
                foreach ($click_ids as $id) {
                    if (isset($params[$id])) {
                        $order->update_meta_data('_wpg_last_' . $id, sanitize_text_field($params[$id]));
                    }
                }
            }
        }
    }

    if ($first_touch) {
        $first_touch = $this->sanitize_array($first_touch);
        $order->update_meta_data('wpg_first', $first_touch);
        foreach ($data_to_save as $key) {
            if (isset($first_touch[$key]) && $first_touch[$key] !== '') {
                $order->update_meta_data('_wpg_first_' . $key, $first_touch[$key]);
            }
        }

        // Extract and save click identifiers from the URL
        if (isset($first_touch['url'])) {
            $url_components = parse_url($first_touch['url']);
            if (isset($url_components['query'])) {
                parse_str($url_components['query'], $params);
                $click_ids = ['gclid', 'fbclid', 'msclkid'];
                foreach ($click_ids as $id) {
                    if (isset($params[$id])) {
                        $order->update_meta_data('_wpg_first_' . $id, sanitize_text_field($params[$id]));
                    }
                }
            }
        }
    }

    $order->save();

    return $order_id;
}