Error checking out with 3D secure payment for existing user

Can you provide the testing card number you used? We have tests covering this and I want to see how we can improve them. Do you have Commerce 2.14?

Unfortunately, the log shows the problem is in an empty #parents array. That makes it really hard to troubleshoot as we don't know what is causing there to be an empty array.

Have you been able to reproduce locally or help provide debugging?

I get a similar bug:

The same steps to reproduce but I have used a real credit card in test mode.
The API answers with: Your card was declined. Your request was in test mode, but used a non test (live) card. For a list of valid test cards, visit: https://stripe.com/docs/testing.
Therefore in doCreatePaymentMethod() the Exception is raised.

Apperently there is an issue with the address form element. Check the image.

Notice: Undefined index: #parents in Drupal\Core\Form\FormElementHelper::getElementByName() (Zeile 26 in /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormElementHelper.php) #0 /var/www/pattydoo/docroot/core/includes/bootstrap.inc(587): _drupal_error_handler_real(8, 'Undefined index...', '/var/www/pattyd...', 26, Array) #1 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormElementHelper.php(26): _drupal_error_handler(8, 'Undefined index...', '/var/www/pattyd...', 26, Array) #2 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormElementHelper.php(29): Drupal\Core\Form\FormElementHelper::getElementByName('payment_informa...', Array) #3 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormElementHelper.php(29): Drupal\Core\Form\FormElementHelper::getElementByName('payment_informa...', Array) #4 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormElementHelper.php(29): Drupal\Core\Form\FormElementHelper::getElementByName('payment_informa...', Array) #5 /var/www/pattydoo/docroot/core/modules/inline_form_errors/src/FormErrorHandler.php(81): Drupal\Core\Form\FormElementHelper::getElementByName('payment_informa...', Array) #6 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormErrorHandler.php(23): Drupal\inline_form_errors\FormErrorHandler->displayErrorMessages(Array, Object(Drupal\Core\Form\FormState)) #7 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormValidator.php(201): Drupal\Core\Form\FormErrorHandler->handleFormErrors(Array, Object(Drupal\Core\Form\FormState)) #8 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormValidator.php(119): Drupal\Core\Form\FormValidator->finalizeValidation(Array, Object(Drupal\Core\Form\FormState), 'commerce_checko...') #9 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormBuilder.php(576): Drupal\Core\Form\FormValidator->validateForm('commerce_checko...', Array, Object(Drupal\Core\Form\FormState)) #10 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormBuilder.php(319): Drupal\Core\Form\FormBuilder->processForm('commerce_checko...', Array, Object(Drupal\Core\Form\FormState)) #11 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Form/FormBuilder.php(217): Drupal\Core\Form\FormBuilder->buildForm(Object(Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\MultistepDefault), Object(Drupal\Core\Form\FormState)) #12 /var/www/pattydoo/docroot/modules/contrib/commerce/modules/checkout/src/Controller/CheckoutController.php(94): Drupal\Core\Form\FormBuilder->getForm(Object(Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\MultistepDefault), 'order_informati...') #13 [internal function]: Drupal\commerce_checkout\Controller\CheckoutController->formPage(Object(Drupal\Core\Routing\RouteMatch)) #14 /var/www/pattydoo/docroot/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #15 /var/www/pattydoo/docroot/core/lib/Drupal/Core/Render/Renderer.php(582): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #16 /var/www/pattydoo/docroot/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #17 /var/www/pattydoo/docroot/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #18 /var/www/pattydoo/vendor/symfony/http-kernel/HttpKernel.php(151): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #19 /var/www/pattydoo/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #20 /var/www/pattydoo/docroot/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #21 /var/www/pattydoo/docroot/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #22 /var/www/pattydoo/docroot/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #23 /var/www/pattydoo/docroot/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #24 /var/www/pattydoo/docroot/modules/contrib/shield/src/ShieldMiddleware.php(115): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #25 /var/www/pattydoo/docroot/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\shield\ShieldMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #26 /var/www/pattydoo/docroot/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #27 /var/www/pattydoo/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #28 /var/www/pattydoo/docroot/core/lib/Drupal/Core/DrupalKernel.php(693): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #29 /var/www/pattydoo/docroot/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #30 {main}.

I opened a MR. This fixes the issue for us, but I am not sure if that's the optimal approach.

This is a duplicate of #3177168: line 1112 of /app/web/core/lib/Drupal/Core/Form/FormState.php when postal code validation fails (although the patch here is perhaps slightly better).