commerce cetelem for drupal 9.5

Hello everyone,

I'm currently working on a new module for Drupal 9 that integrates with Cetelem payment service. I have completed the module, but I'm facing a small issue.

The problem occurs after a customer completes the purchase process and makes the payment successfully through Cetelem. Once the payment is processed by Cetelem, the customer is redirected back to the website. However, in some cases, the order is not properly placed and remains in the cart instead.

I'm seeking assistance or suggestions on how to resolve this issue and ensure that orders are properly placed after the payment is successfully processed through Cetelem.

Here is my OnReturn i try to create the order there but doesnt work like i expected.

public function onReturn(OrderInterface $order, Request $request) {
    $payment_storage = $this->entityTypeManager->getStorage('commerce_payment');
    $payment = $payment_storage->create([
      'state' => 'Pendiente',
      'amount' => $order->getTotalPrice(),
      'payment_gateway' => $this->parentEntity->id(),
      'order_id' => $order->id(),
    ]);
      $state_transitions = $order->getState()->getTransitions();
      if (isset($state_transitions['place'])) {
        $order->getState()->applyTransition($state_transitions['place']);
      }

      $payment->setState('Pendiente');
      $order->save();

    $payment->save();

    $url = Url::fromRoute('commerce_checkout.form', ['commerce_order' => $order->id(), 'step' => 'complete']);
    $response = new Response('', 302);
    $response->headers->set('Location', $url->toString());
    return $response;
  }

Here is the GitHub repository

https://github.com/ProdigiaProgramacion/commerce-payment-cetelem

Thank you for your attention and any help you can provide.

Update: I get this error in the log:
Ruta: /checkout/231063/payment/return. Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException: en Drupal\Core\Routing\AccessAwareRouter->checkAccess() (línea 121 de /home/mitortug/public_html/d9.mitortuga/docroot/core/lib/Drupal/Core/Routing/AccessAwareRouter.php).