Index.php

<?php
namespace BobGroup\BobGo\Controller\Tracking;

use Magento\Framework\App\Action\Context;
use Magento\Framework\View\Result\PageFactory;
use Magento\Framework\Registry;
use Psr\Log\LoggerInterface;
use Magento\Framework\Controller\Result\JsonFactory;
use Magento\Framework\HTTP\Client\Curl;
use Magento\Store\Model\StoreManagerInterface;
use BobGroup\BobGo\Model\Carrier\UData;

class Index extends \Magento\Framework\App\Action\Action
{
    protected $resultPageFactory;
    protected $jsonFactory;
    protected $curl;
    protected $logger;
    protected $registry;
    protected StoreManagerInterface $storeManager;

    public function __construct(
        Context $context,
        PageFactory $resultPageFactory,
        JsonFactory $jsonFactory,
        LoggerInterface $logger,
        StoreManagerInterface $storeManager,
        Curl $curl,
        Registry $registry // Add Registry
    ) {
        $this->resultPageFactory = $resultPageFactory;
        $this->jsonFactory = $jsonFactory;
        $this->logger = $logger;
        $this->storeManager = $storeManager;
        $this->curl = $curl;
        $this->registry = $registry; // Assign Registry
        parent::__construct($context);
    }

    public function execute()
    {
        $this->logger->info('Page Controller is executed.');
        $trackingReference = $this->getRequest()->getParam('order_reference');

        $this->logger->info('Tracking reference:', [$trackingReference]);

        $channel = $this->getStoreUrl();

        $this->logger->info('Channel:', [$channel]);

        if ($trackingReference) {
            $trackingUrl = sprintf(UData::TRACKING, $channel, $trackingReference);

            try {
                $this->curl->get($trackingUrl);
                $response = $this->curl->getBody();

                $this->logger->info('Response:', [$response]);

                $decodedResponse = json_decode($response, true);
                $this->logger->info('Decoded Response:', [$decodedResponse]);

                if (is_array($decodedResponse) && isset($decodedResponse[0])) {
                    $shipmentData = $decodedResponse[0];

                    // Save data to the registry
                    $this->registry->register('shipment_data', $shipmentData);
                    $this->logger->info('Shipment data registered in the registry.');

                } else {