hikashop Error: 0 Call to a member function getName() on null

<?php
/*
 * A payment plugin called "example". This is the main file of the plugin.
 */
defined('_JEXEC') or die('Restricted access');

require $_SERVER['DOCUMENT_ROOT'] . '/vendor/autoload.php';

// You need to extend from the hikashopPaymentPlugin class which already define lots of functions in order to simplify your work
class plgHikashoppaymentExample extends hikashopPaymentPlugin
{

    //Payment plugin name (the name of the PHP file)
    var $accepted_currencies = array('USD', 'GBP', 'EUR', 'JPY', 'CAD', 'AUD');
    var $multiple = true;
    var $name = 'example';

    var $pluginConfig = array(
        'login' => array('HIKA_USERNAME', 'input'),
        'password' => array('HIKA_PASSWORD', 'input'),
        'signature' => array('SIGNATURE', 'input'),
        'environnement' => array('ENVIRONNEMENT', 'list', array(
            'production' => 'HIKA_PRODUCTION',
            'sandbox' => 'HIKA_SANDBOX',
            'beta-sandbox' => 'Beta-Sandbox'
        )),
        'instant_capture' => array('Instant Capture', 'boolean', '0'),
        'ask_ccv' => array('Ask CCV', 'boolean', '1'),
        'details' => array('SEND_DETAILS_OF_ORDER', 'boolean', '1'),
        'send_order_id' => array('Send order id', 'boolean', '0'),
        'send_notification' => array('ORDER_NOTIFICATION', 'boolean', '0'),
        'debug' => array('DEBUG', 'boolean', '0'),
        'cancel_url' => array('CANCEL_URL', 'input'),
        'return_url' => array('RETURN_URL', 'input'),
        'verified_status' => array('VERIFIED_STATUS', 'orderstatus')
    );

    function needCC(&$method)
    {

            $method->custom_html = '
            <script src="https://js.stripe.com/v3/"></script>
            <input type="hidden" id="hiddencontainer" name="hiddencontainer"/>

            <div id="payment-request-button">
              <!-- A Stripe Element will be inserted here. -->
            </div>
            <script>
                
                const stripe = Stripe("secretkeygoeshere", {
                    apiVersion: "2020-08-27",
                });
                
                console.log("amount in basket: ", document.getElementsByClassName("hikashop-count")[0].innerHTML);                
                
                let amount = 3495 * document.getElementsByClassName("hikashop-count")[0].innerHTML;
                let label = "ellaOne x" + document.getElementsByClassName("hikashop-count")[0].innerHTML + "tablet";
                
                const paymentRequest = stripe.paymentRequest({
                    country: "GB",
                    currency: "gbp",
                    total: {
                        label: label,
                        amount:amount,
                    },
                });
                const elements = stripe.elements();
                const prButton = elements.create("paymentRequestButton", {
                  paymentRequest,
                });
                
                (async () => {
                // Check the availability of the Payment Request API first.
                const result = await paymentRequest.canMakePayment();
                    if (result) {
                        prButton.mount("#payment-request-button");
                    } else {
                        document.getElementById("payment-request-button").style.display = "none";
                    }
                })();
                
                async function handleServerResponse(response, complete) {
                    if (response.error) {
                        complete("fail");
                    } else if (response.requires_action) {
                        complete("success");
                        await handleAction(response);
                    } else {
                        complete("success");
                        console.log("MISHA");
            
                        let myhidden = document.getElementById("hiddencontainer");
                        myhidden.value = 1;
            
                    }
                }
            
                async function handleAction(response) {
                    const {
                        error: errorAction,
                        paymentIntent
                    } = await stripe.handleCardAction(
                        response.payment_intent_client_secret
                    );
            
                    if (errorAction) {
                        // Show error from Stripe.js in payment form
                    } else {
                        const response = await fetch(
                            "/plugins/hikashoppayment/example/confirm_payment.php", {
                                method: "POST",
                                headers: {
                                    "Content-Type": "application/json"
                                },
                                body: JSON.stringify({
                                    payment_intent_id: paymentIntent.id
                                })
                            }
                        );
            
                        // Step 3: handle server response
                        handleServerResponse(await response.json());
                    }
                }
                    
                paymentRequest.on("paymentmethod",
                  async ({paymentMethod, complete}) => {
                    // Send paymentMethod to server
                    const response = await fetch(
                        "index.php?option=com_helloworld&format=ajax&lang=en&view=helloworld&task=getArticles&tmpl=component", {
                        method: "POST",
                        headers: {
                          "Content-Type": "application/json"
                        },
                        body: JSON.stringify({
                          payment_method_id: paymentMethod.id
                        })
                      }
                    )
                
                    // Step 3: handle server response
                    await handleServerResponse(await response.json(), complete);
                });
            </script>
            ';

            return true;
    }
}
?>

<?php
# vendor using composer


require $_SERVER['DOCUMENT_ROOT'] . '/vendor/autoload.php';

defined('_JEXEC') or die;

//ini_set('display_errors', 1);
//ini_set('display_startup_errors', 1);
//error_reporting(E_ALL);

\Stripe\Stripe::setApiKey('secretkeygoeshere');

header('Content-Type: application/json');

class HelloWorldViewHelloWorld extends JViewLegacy
{

    function display($tpl = null)
    {

        $app = JFactory::getApplication();
        $user = JFactory::getUser();
        $userId = $user->get('id');

        $task = JRequest::getString('task');

        switch ($task) {

            case "getArticles":

                $this->_getArticles();

                break;

        }
        parent::display($tpl);

        jexit();

    }


    public function _getArticles()
    {

# retrieve json from POST body
        $json_str = file_get_contents('php://input');
        $json_obj = json_decode($json_str);

        $intent = null;
        try {
            if (isset($json_obj->payment_method_id)) {
                # Create the PaymentIntent
                $intent = \Stripe\PaymentIntent::create([
                    'payment_method' => $json_obj->payment_method_id,
                    'amount' => 3495,
                    'currency' => 'gbp',
                    'confirmation_method' => 'manual',
                    'confirm' => true,
                ]);
            }
            if (isset($json_obj->payment_intent_id)) {
                $intent = \Stripe\PaymentIntent::retrieve(
                    $json_obj->payment_intent_id
                );
                $intent->confirm();
            }
            $this->generateResponse($intent);
        } catch (\Stripe\Exception\ApiErrorException $e) {
            # Display error on client
            echo json_encode([
                'error' => $e->getMessage()
            ]);
        }
    }


    function generateResponse($intent)
    {
        # Note that if your API version is before 2019-02-11, 'requires_action'
        # appears as 'requires_source_action'.
        if ($intent->status == 'requires_action' &&
            $intent->next_action->type == 'use_stripe_sdk') {
            # Tell the client to handle the action
            echo json_encode([
                'requires_action' => true,
                'payment_intent_client_secret' => $intent->client_secret
            ]);
        } else if ($intent->status == 'succeeded') {
            # The payment didn’t need any additional actions and completed!
            # Handle post-payment fulfillment
            echo json_encode([
                "success" => true,
            ]);

            $hikashopHelper = rtrim(JPATH_ADMINISTRATOR, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR . 'components' . DIRECTORY_SEPARATOR . 'com_hikashop' . DIRECTORY_SEPARATOR . 'helpers' . DIRECTORY_SEPARATOR . 'helper.php';

            if (!file_exists($hikashopHelper) || !include_once($hikashopHelper)) {
                echo "HIKA NOT WORKING";
                return;
            }

            $cartClass = hikashop_get('class.cart');
            $orderClass = hikashop_get('class.order');

            $cart = $cartClass->getFullCart();

            $cart_id = $cart->cart_id;
            
            //Error here
            $order = $orderClass->createFromCart($cart_id);

            

//            $orderClass = hikashop_get('class.cart');
//        $orderClass->createFromCart(0);
        } else {
            # Invalid status
            http_response_code(500);
            echo json_encode(['error' => 'Invalid PaymentIntent status']);
        }
    }

}