I am building a Offsite Payment module which contains a Page callback created inside a Controller (website.com/payment-accepted)

After completed form (payment method, address…) on checkout page, The buyer is redirected to another website to pay. Once payment is accepted, the page website.com/payment-accepted is automatically called.

I would like to create new payment when this page is called. Here the code :

      public function MyCallbackPage(OrderInterface $  order, Request $  request) {    $  payment_storage = $  this->entityTypeManager()->getStorage('commerce_payment');             $  payment = $  payment_storage->create([               'state' => 'authorization',               'amount' => $  order->getTotalPrice(),               'payment_gateway' => 'paybox',               'order_id' => $  order->id(),               'remote_id' => $  request->query->get('tx_nid'),               'remote_state' => $  request->query->get('payment_status'),             ]);             $  payment->save();      } 

But i get this error :

User error: "0" is an invalid render array key in Drupal\Core\Render\Element::children() (line 97 of core/lib/Drupal/Core/Render/Element.php).  Drupal\Core\Render\Element::children(Array, 1) (Line: 408) Drupal\Core\Render\Renderer->doRender(Array) (Line: 450) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array, ) (Line: 226) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 576) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 227) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) (Line: 108) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 158) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 657) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)  User error: "1" is an invalid render array key in Drupal\Core\Render\Element::children() (line 97 of core/lib/Drupal/Core/Render/Element.php).  Drupal\Core\Render\Element::children(Array, 1) (Line: 408) Drupal\Core\Render\Renderer->doRender(Array) (Line: 450) Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195) Drupal\Core\Render\Renderer->render(Array, ) (Line: 226) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 576) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 227) Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) (Line: 108) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 158) Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57) Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 657) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)