diff --git a/modules/checkout/commerce_checkout.module b/modules/checkout/commerce_checkout.module
index 522ac15..8fc8501 100644
--- a/modules/checkout/commerce_checkout.module
+++ b/modules/checkout/commerce_checkout.module
@@ -43,6 +43,9 @@ function commerce_checkout_theme() {
     'commerce_checkout_pane' => [
       'render element' => 'elements',
     ],
+    'commerce_checkout_completion_registration' => [
+      'render element' => 'form',
+    ],
   ];
 
   return $theme;
diff --git a/modules/checkout/src/Event/CheckoutAccountCreateEvent.php b/modules/checkout/src/Event/CheckoutAccountCreateEvent.php
new file mode 100644
index 0000000..8878c43
--- /dev/null
+++ b/modules/checkout/src/Event/CheckoutAccountCreateEvent.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace Drupal\commerce_checkout\Event;
+
+use Drupal\commerce_order\Entity\OrderInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Url;
+use Symfony\Component\EventDispatcher\Event;
+
+/**
+ * Defines the event for creating an account during checkout.
+ */
+class CheckoutAccountCreateEvent extends Event {
+
+  /**
+   * The account created during checkout.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $account;
+
+  /**
+   * The checkout order.
+   *
+   * @var \Drupal\commerce_order\Entity\OrderInterface
+   */
+  protected $order;
+
+  /**
+   * The URL to redirect to after creating an account.
+   *
+   * @var \Drupal\Core\Url|null
+   */
+  protected $redirect;
+
+  /**
+   * Constructs a new CheckoutAccountCreateEvent object.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The account created during checkout.
+   * @param \Drupal\commerce_order\Entity\OrderInterface $order
+   *   The checkout order.
+   */
+  public function __construct(AccountInterface $account, OrderInterface $order) {
+    $this->account = $account;
+    $this->order = $order;
+  }
+
+  /**
+   * Gets the created account.
+   *
+   * @return \Drupal\Core\Session\AccountInterface
+   *   The account created during checkout.
+   */
+  public function getAccount() {
+    return $this->account;
+  }
+
+  /**
+   * Gets the checkout order.
+   *
+   * @return \Drupal\commerce_order\Entity\OrderInterface
+   *   The checkout order.
+   */
+  public function getOrder() {
+    return $this->order;
+  }
+
+  /**
+   * Sets the redirect for redirecting after the account event has finished.
+   *
+   * @param string $route_name
+   *   The name of the route
+   * @param array $route_parameters
+   *   (optional) An associative array of parameter names and values.
+   * @param array $options
+   *   (optional) An associative array of additional options. See
+   *   \Drupal\Core\Url for the available keys.
+   *
+   * @return $this
+   */
+  public function setRedirect($route_name, array $route_parameters = [], array $options = []) {
+    $url = new Url($route_name, $route_parameters, $options);
+    return $this->setRedirectUrl($url);
+  }
+
+  /**
+   * Sets the redirect URL for redirecting after the account event has finished.
+   *
+   * @param \Drupal\Core\Url $url
+   *   The URL to redirect to.
+   *
+   * @return $this
+   */
+  public function setRedirectUrl(Url $url) {
+    $this->redirect = $url;
+    return $this;
+  }
+
+  /**
+   * Gets the value to use for redirecting after the account event has finished.
+   *
+   * @return \Drupal\Core\Url|null
+   *   A redirect url, if set. Null otherwise.
+   */
+  public function getRedirectUrl() {
+    return $this->redirect;
+  }
+
+}
diff --git a/modules/checkout/src/Event/CheckoutEvents.php b/modules/checkout/src/Event/CheckoutEvents.php
new file mode 100644
index 0000000..b766bd7
--- /dev/null
+++ b/modules/checkout/src/Event/CheckoutEvents.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Drupal\commerce_checkout\Event;
+
+/**
+ * Defines events for the Commerce checkout module.
+ */
+final class CheckoutEvents {
+
+  /**
+   * Name of the event fired when an account gets created during checkout.
+   *
+   * @Event
+   *
+   * @see \Drupal\commerce_checkout\Event\CheckoutAccountCreateEvent
+   */
+  const ACCOUNT_CREATE = 'commerce_checkout.account_create';
+
+}
diff --git a/modules/checkout/src/Plugin/Commerce/CheckoutPane/CompletionRegistration.php b/modules/checkout/src/Plugin/Commerce/CheckoutPane/CompletionRegistration.php
new file mode 100644
index 0000000..f61d953
--- /dev/null
+++ b/modules/checkout/src/Plugin/Commerce/CheckoutPane/CompletionRegistration.php
@@ -0,0 +1,243 @@
+<?php
+
+namespace Drupal\commerce_checkout\Plugin\Commerce\CheckoutPane;
+
+use Drupal\commerce\CredentialsCheckFloodInterface;
+use Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\CheckoutFlowInterface;
+use Drupal\commerce_checkout\Event\CheckoutAccountCreateEvent;
+use Drupal\commerce_checkout\Event\CheckoutEvents;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\user\UserAuthInterface;
+use Drupal\user\UserInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\HttpFoundation\RequestStack;
+
+/**
+ * Provides the registration pane.
+ *
+ * @CommerceCheckoutPane(
+ *   id = "completion_registration",
+ *   label = @Translation("Guest registration after checkout"),
+ * )
+ */
+class CompletionRegistration extends CheckoutPaneBase implements CheckoutPaneInterface, ContainerFactoryPluginInterface {
+
+  /**
+   * The credentials check flood controller.
+   *
+   * @var \Drupal\commerce\CredentialsCheckFloodInterface
+   */
+  protected $credentialsCheckFlood;
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $currentUser;
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * The user authentication object.
+   *
+   * @var \Drupal\user\UserAuthInterface
+   */
+  protected $userAuth;
+
+  /**
+   * The client IP address.
+   *
+   * @var string
+   */
+  protected $clientIp;
+
+  /**
+   * The event dispatcher.
+   *
+   * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface
+   */
+  protected $eventDispatcher;
+
+  /**
+   * Constructs a new CompletionRegistration object.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\CheckoutFlowInterface $checkout_flow
+   *   The parent checkout flow.
+   * @param \Drupal\commerce\CredentialsCheckFloodInterface $credentials_check_flood
+   *   The credentials check flood controller.
+   * @param \Drupal\Core\Session\AccountInterface $current_user
+   *   The current user.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   * @param \Drupal\user\UserAuthInterface $user_auth
+   *   The user authentication object.
+   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
+   *   The request stack.
+   * @param \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher
+   *   The event dispatcher.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, CheckoutFlowInterface $checkout_flow, CredentialsCheckFloodInterface $credentials_check_flood, AccountInterface $current_user, EntityTypeManagerInterface $entity_type_manager, UserAuthInterface $user_auth, RequestStack $request_stack, EventDispatcherInterface $event_dispatcher) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition, $checkout_flow, $entity_type_manager);
+
+    $this->credentialsCheckFlood = $credentials_check_flood;
+    $this->currentUser = $current_user;
+    $this->entityTypeManager = $entity_type_manager;
+    $this->userAuth = $user_auth;
+    $this->clientIp = $request_stack->getCurrentRequest()->getClientIp();
+    $this->eventDispatcher = $event_dispatcher;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, CheckoutFlowInterface $checkout_flow = NULL) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $checkout_flow,
+      $container->get('commerce.credentials_check_flood'),
+      $container->get('current_user'),
+      $container->get('entity_type.manager'),
+      $container->get('user.auth'),
+      $container->get('request_stack'),
+      $container->get('event_dispatcher')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isVisible() {
+    return $this->currentUser->isAnonymous();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildPaneForm(array $pane_form, FormStateInterface $form_state, array &$complete_form) {
+    // Ensure that there is no user on the site with the same email address.
+    $existing_user = $this->entityTypeManager->getStorage('user')->loadByProperties(['mail' => $this->order->getEmail()]);
+
+    if ($existing_user) {
+      return $pane_form;
+    }
+
+    $pane_form['register'] = [
+      '#type' => 'fieldset',
+      '#title' => $this->t('Account information'),
+    ];
+
+    $pane_form['register']['name'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Username'),
+      '#maxlength' => UserInterface::USERNAME_MAX_LENGTH,
+      '#description' => $this->t("Several special characters are allowed, including space, period (.), hyphen (-), apostrophe ('), underscore (_), and the @ sign."),
+      '#required' => FALSE,
+      '#attributes' => [
+        'class' => ['username'],
+        'autocorrect' => 'off',
+        'autocapitalize' => 'off',
+        'spellcheck' => 'false',
+      ],
+      '#default_value' => '',
+    ];
+
+    $pane_form['register']['password'] = [
+      '#type' => 'password_confirm',
+      '#size' => 60,
+      '#description' => $this->t('Provide a password for the new account.'),
+      '#required' => TRUE,
+    ];
+
+    $pane_form['register']['actions'] = ['#type' => 'actions'];
+    $pane_form['register']['actions']['register'] = [
+      '#type' => 'submit',
+      '#value' => $this->t('Create my account'),
+      '#name' => 'commerce_checkout_completion_registration_submit',
+    ];
+
+    return [
+      '#theme' => 'commerce_checkout_completion_registration',
+      'form' => $pane_form,
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validatePaneForm(array &$pane_form, FormStateInterface $form_state, array &$complete_form) {
+    // Validate the entity. This will ensure that the username and email are in
+    // the right format and not already taken. The pane should only appear for
+    // a non-existent email, but users can modify the email for their account.
+    $account = $this->entityTypeManager->getStorage('user')->create([
+      'pass' => $form_state->getValue(['completion_registration', 'register', 'password']),
+      'mail' => $this->order->getEmail(),
+      'name' => $form_state->getValue(['completion_registration', 'register', 'name']),
+    ]);
+    $form_state->setTemporaryValue('new_account', $account);
+
+    $violations = $account->validate();
+    foreach ($violations->getByFields(['name']) as $violation) {
+      list($field_name) = explode('.', $violation->getPropertyPath(), 2);
+      $form_state->setError($pane_form['form']['register'][$field_name], $violation->getMessage());
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitPaneForm(array &$pane_form, FormStateInterface $form_state, array &$complete_form) {
+    /** @var \Drupal\user\User $user */
+    $user = $form_state->getTemporaryValue('new_account');
+    $user->enforceIsNew();
+    $user->activate();
+    $user->save();
+
+    // Load the new user account.
+    /** @var \Drupal\user\UserInterface $account */
+    $account = $this->entityTypeManager->getStorage('user')->load($user->id());
+
+    user_login_finalize($account);
+    drupal_set_message($this->t('Registration successful. You are now logged in.'));
+    $this->order->setCustomer($account);
+
+    // Add the billing profile to the user's address book.
+    $profile = $this->order->getBillingProfile();
+    if ($profile) {
+      $profile->setOwner($account);
+      $profile->save();
+    }
+
+    // Normally advancing steps in the checkout automatically saves the order.
+    // Since this pane occurs on the last step, manual order saving is needed.
+    $this->order->save();
+
+    $this->credentialsCheckFlood->clearAccount($this->clientIp, $account->getAccountName());
+
+    // Notify other modules about the account creation.
+    $event = new CheckoutAccountCreateEvent($account, $this->order);
+    $this->eventDispatcher->dispatch(CheckoutEvents::ACCOUNT_CREATE, $event);
+    // Redirect the user to a different page, if a redirect has been set.
+    if ($url = $event->getRedirectUrl()) {
+      $form_state->setRedirectUrl($url);
+    }
+  }
+
+}
diff --git a/modules/checkout/src/Plugin/Commerce/CheckoutPane/Login.php b/modules/checkout/src/Plugin/Commerce/CheckoutPane/Login.php
index a49bf09..eef86f4 100644
--- a/modules/checkout/src/Plugin/Commerce/CheckoutPane/Login.php
+++ b/modules/checkout/src/Plugin/Commerce/CheckoutPane/Login.php
@@ -233,7 +233,7 @@ class Login extends CheckoutPaneBase implements CheckoutPaneInterface, Container
     $pane_form['guest']['text'] = [
       '#prefix' => '<p>',
       '#suffix' => '</p>',
-      '#markup' => $this->t('Proceed to checkout. You can optionally create an account at the end.'),
+      '#markup' => $this->isRegistrationPaneAvailable() ? $this->t('Proceed to checkout. You can optionally create an account at the end.') : $this->t('Proceed to checkout.'),
     ];
     $pane_form['guest']['continue'] = [
       '#type' => 'submit',
@@ -292,7 +292,8 @@ class Login extends CheckoutPaneBase implements CheckoutPaneInterface, Container
   public function validatePaneForm(array &$pane_form, FormStateInterface $form_state, array &$complete_form) {
     $values = $form_state->getValue($pane_form['#parents']);
     $triggering_element = $form_state->getTriggeringElement();
-    switch ($triggering_element['#op']) {
+    $trigger = !empty($triggering_element['#op']) ? $triggering_element['#op']: 'continue';
+    switch ($trigger) {
       case 'continue':
         return;
 
@@ -376,7 +377,8 @@ class Login extends CheckoutPaneBase implements CheckoutPaneInterface, Container
    */
   public function submitPaneForm(array &$pane_form, FormStateInterface $form_state, array &$complete_form) {
     $triggering_element = $form_state->getTriggeringElement();
-    switch ($triggering_element['#op']) {
+    $trigger = !empty($triggering_element['#op']) ? $triggering_element['#op']: 'continue';
+    switch ($trigger) {
       case 'continue':
         break;
 
@@ -397,4 +399,16 @@ class Login extends CheckoutPaneBase implements CheckoutPaneInterface, Container
     ]);
   }
 
+  /**
+   * Checks if guests can register at the end of the process.
+   *
+   * @return bool
+   *   TRUE if guests may create an account.
+   *   FALSE otherwise.
+   */
+  protected function isRegistrationPaneAvailable() {
+    $panes = $this->checkoutFlow->getPanes();
+    return !empty($panes['completion_registration']->getConfiguration()['step']) && $panes['completion_registration']->getConfiguration()['step'] != '_disabled';
+  }
+
 }
diff --git a/modules/checkout/templates/commerce-checkout-completion-registration.html.twig b/modules/checkout/templates/commerce-checkout-completion-registration.html.twig
new file mode 100644
index 0000000..63997f5
--- /dev/null
+++ b/modules/checkout/templates/commerce-checkout-completion-registration.html.twig
@@ -0,0 +1,20 @@
+{#
+/**
+ * @file
+ * A layout for the checkout registration form
+ *
+ * Available variables:
+ * - form: The form.
+ *
+ * @ingroup themeable
+ */
+#}
+<div class="commerce-checkout-completion-registration">
+  <div class="commerce-checkout-completion-registration__text">
+    <h2>{%trans%}Create an account?{%endtrans%}</h2>
+    <p>{%trans%}Complete your account registration now to be able to access your order information at any time.{%endtrans%}</p>
+  </div>
+  <div class="commerce-checkout-completion-registration__form">
+    {{ form }}
+  </div>
+</div>
diff --git a/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/commerce_checkout_account_create_event_test.info.yml b/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/commerce_checkout_account_create_event_test.info.yml
new file mode 100644
index 0000000..425ebcd
--- /dev/null
+++ b/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/commerce_checkout_account_create_event_test.info.yml
@@ -0,0 +1,5 @@
+name: Commerce Checkout Account Create Event Test
+type: module
+description: 'Helper module for testing creating an account after checkout.'
+package: Testing
+core: 8.x
diff --git a/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/commerce_checkout_account_create_event_test.service.yml b/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/commerce_checkout_account_create_event_test.service.yml
new file mode 100644
index 0000000..9671250
--- /dev/null
+++ b/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/commerce_checkout_account_create_event_test.service.yml
@@ -0,0 +1,5 @@
+services:
+  commerce_checkout_account_create_event_test.account_create:
+    class: Drupal\commerce_checkout_account_create_event_test\EventSubscriber\AccountCreate
+    tags:
+      - {name: event_subscriber}
diff --git a/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/src/EventSubscriber/AccountCreate.php b/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/src/EventSubscriber/AccountCreate.php
new file mode 100644
index 0000000..c670c0f
--- /dev/null
+++ b/modules/checkout/tests/modules/commerce_checkout_account_create_event_test/src/EventSubscriber/AccountCreate.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Drupal\commerce_checkout_account_create_event_test\EventSubscriber;
+
+use Drupal\commerce_checkout\Event\AccountCreateEvent;
+use Drupal\commerce_checkout\Event\CheckoutEvents;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Event subscriber for acting upon account creation during checkout.
+ */
+class AccountCreate implements EventSubscriberInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events[CheckoutEvents::ACCOUNT_CREATE][] = 'checkoutComplete';
+    return $events;
+  }
+
+  /**
+   * Reacts on accounts being created.
+   *
+   * @param \Drupal\commerce_checkout\Event\AccountCreateEvent $event
+   *   The account create event.
+   */
+  public function checkoutComplete(AccountCreateEvent $event) {
+    /** @var \Drupal\Core\Session\AccountInterface $account */
+    $account = $event->getAccount();
+
+    // Set a redirect to the user edit page.
+    $event->setRedirect('entity.user.edit_form', [
+      'user' => $account->id(),
+    ]);
+  }
+
+}
diff --git a/modules/checkout/tests/src/Functional/CheckoutOrderTest.php b/modules/checkout/tests/src/Functional/CheckoutOrderTest.php
index 22cb253..6bbdc37 100644
--- a/modules/checkout/tests/src/Functional/CheckoutOrderTest.php
+++ b/modules/checkout/tests/src/Functional/CheckoutOrderTest.php
@@ -203,7 +203,9 @@ class CheckoutOrderTest extends CommerceBrowserTestBase {
   }
 
   /**
-   * Tests that you can register from the checkout pane.
+   * Tests that you can register from the login checkout pane.
+   *
+   * This checkout pane usually appears on the "login" step.
    */
   public function testRegisterOrderCheckout() {
     $config = \Drupal::configFactory()->getEditable('commerce_checkout.commerce_checkout_flow.default');
@@ -285,6 +287,201 @@ class CheckoutOrderTest extends CommerceBrowserTestBase {
   }
 
   /**
+   * Tests that you can register after completing the order as a guest.
+   */
+  public function testRegistrationAfterGuestOrderCheckout() {
+    // Enable the completion_registration pane.
+    /** @var \Drupal\commerce_checkout\Entity\CheckoutFlowInterface $checkout_flow */
+    $checkout_flow = $this->container
+      ->get('entity_type.manager')
+      ->getStorage('commerce_checkout_flow')
+      ->load('default');
+    /** @var \Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\CheckoutFlowInterface $checkout_flow_plugin */
+    $checkout_flow_plugin = $checkout_flow->getPlugin();
+    /** @var \Drupal\commerce_checkout\Plugin\Commerce\CheckoutPane\CompletionRegistration $pane */
+    $pane = $checkout_flow_plugin->getPane('completion_registration');
+    $pane->setConfiguration([]);
+    $pane->setStepId('complete');
+    $checkout_flow_plugin_configuration = $checkout_flow_plugin->getConfiguration();
+    $checkout_flow_plugin_configuration['panes']['completion_registration'] = $pane->getConfiguration();
+    $checkout_flow_plugin->setConfiguration($checkout_flow_plugin_configuration);
+    $checkout_flow->save();
+
+    $this->drupalLogout();
+    $this->drupalGet($this->product->toUrl()->toString());
+    $this->submitForm([], 'Add to cart');
+    $cart_link = $this->getSession()->getPage()->findLink('your cart');
+    $cart_link->click();
+    $this->submitForm([], 'Checkout');
+
+    // Checkout as guest.
+    $this->assertCheckoutProgressStep('Login');
+    $this->submitForm([], 'Continue as Guest');
+    $this->assertCheckoutProgressStep('Order information');
+    $this->submitForm([
+      'contact_information[email]' => 'guest@example.com',
+      'contact_information[email_confirm]' => 'guest@example.com',
+      'billing_information[profile][address][0][address][given_name]' => $this->randomString(),
+      'billing_information[profile][address][0][address][family_name]' => $this->randomString(),
+      'billing_information[profile][address][0][address][organization]' => $this->randomString(),
+      'billing_information[profile][address][0][address][address_line1]' => $this->randomString(),
+      'billing_information[profile][address][0][address][postal_code]' => '94043',
+      'billing_information[profile][address][0][address][locality]' => 'Mountain View',
+      'billing_information[profile][address][0][address][administrative_area]' => 'CA',
+    ], 'Continue to review');
+    $this->assertCheckoutProgressStep('Review');
+    $this->assertSession()->pageTextContains('Contact information');
+    $this->assertSession()->pageTextContains('Billing information');
+    $this->assertSession()->pageTextContains('Order Summary');
+    $this->submitForm([], 'Complete checkout');
+    $this->assertSession()->pageTextContains('Your order number is 1. You can view your order on your account page when logged in.');
+
+    // Assert that the completion_registration checkout pane is shown.
+    $this->assertSession()->pageTextContains('Create an account?');
+    // Register.
+    $this->submitForm([
+      'completion_registration[register][name]' => 'User name',
+      'completion_registration[register][password][pass1]' => 'pass',
+      'completion_registration[register][password][pass2]' => 'pass',
+    ], 'Create my account');
+    // Assert that the account was created successfully.
+    $this->assertSession()->pageTextContains('Registration successful. You are now logged in.');
+
+    // Log out and try to login again with the chosen password.
+    $this->drupalLogout();
+    $accounts = \Drupal::service('entity_type.manager')->getStorage('user')->loadByProperties(['mail' => 'guest@example.com']);
+    $account = reset($accounts);
+    $account->passRaw = 'pass';
+    $this->drupalLogin($account);
+
+    // Checkout again as guest to test account validation.
+    $this->drupalLogout();
+    $this->drupalGet($this->product->toUrl()->toString());
+    $this->submitForm([], 'Add to cart');
+    $cart_link = $this->getSession()->getPage()->findLink('your cart');
+    $cart_link->click();
+    $this->submitForm([], 'Checkout');
+    $this->assertCheckoutProgressStep('Login');
+    $this->submitForm([], 'Continue as Guest');
+    $this->assertCheckoutProgressStep('Order information');
+    $this->submitForm([
+      'contact_information[email]' => 'guest2@example.com',
+      'contact_information[email_confirm]' => 'guest2@example.com',
+      'billing_information[profile][address][0][address][given_name]' => $this->randomString(),
+      'billing_information[profile][address][0][address][family_name]' => $this->randomString(),
+      'billing_information[profile][address][0][address][organization]' => $this->randomString(),
+      'billing_information[profile][address][0][address][address_line1]' => $this->randomString(),
+      'billing_information[profile][address][0][address][postal_code]' => '94043',
+      'billing_information[profile][address][0][address][locality]' => 'Mountain View',
+      'billing_information[profile][address][0][address][administrative_area]' => 'CA',
+    ], 'Continue to review');
+    $this->assertCheckoutProgressStep('Review');
+    $this->assertSession()->pageTextContains('Contact information');
+    $this->assertSession()->pageTextContains('Billing information');
+    $this->assertSession()->pageTextContains('Order Summary');
+    $this->submitForm([], 'Complete checkout');
+    $this->assertSession()->pageTextContains('Your order number is 2. You can view your order on your account page when logged in.');
+
+    $this->submitForm([
+      'completion_registration[register][name]' => '',
+      'completion_registration[register][password][pass1]' => 'pass',
+      'completion_registration[register][password][pass2]' => 'pass',
+    ], 'Create my account');
+    $this->assertSession()->pageTextContains('You must enter a username.');
+
+    $this->submitForm([
+      'completion_registration[register][name]' => 'User name',
+      'completion_registration[register][password][pass1]' => '',
+      'completion_registration[register][password][pass2]' => '',
+    ], 'Create my account');
+    $this->assertSession()->pageTextContains('Password field is required.');
+
+    $this->submitForm([
+      'completion_registration[register][name]' => 'User @#.``^ ù % name invalid',
+      'completion_registration[register][password][pass1]' => 'pass',
+      'completion_registration[register][password][pass2]' => 'pass',
+    ], 'Create my account');
+    $this->assertSession()->pageTextContains('The username contains an illegal character.');
+
+    $this->submitForm([
+      'completion_registration[register][name]' => 'User name',
+      'completion_registration[register][password][pass1]' => 'pass',
+      'completion_registration[register][password][pass2]' => 'pass',
+    ], 'Create my account');
+    $this->assertSession()->pageTextContains('The username User name is already taken.');
+  }
+
+  /**
+   * Tests that you can get redirected after registering at the end of checkout.
+   */
+  public function testRedirectAfterRegistrationOnCheckout() {
+    // Enable the test module 'commerce_checkout_account_create_event_test'.
+    $this->container
+      ->get('module_installer')
+      ->install(['commerce_checkout_account_create_event_test']);
+
+    // Enable the completion_registration pane.
+    /** @var \Drupal\commerce_checkout\Entity\CheckoutFlowInterface $checkout_flow */
+    $checkout_flow = $this->container
+      ->get('entity_type.manager')
+      ->getStorage('commerce_checkout_flow')
+      ->load('default');
+    /** @var \Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\CheckoutFlowInterface $checkout_flow_plugin */
+    $checkout_flow_plugin = $checkout_flow->getPlugin();
+    /** @var \Drupal\commerce_checkout\Plugin\Commerce\CheckoutPane\CompletionRegistration $pane */
+    $pane = $checkout_flow_plugin->getPane('completion_registration');
+    $pane->setConfiguration([]);
+    $pane->setStepId('complete');
+    $checkout_flow_plugin_configuration = $checkout_flow_plugin->getConfiguration();
+    $checkout_flow_plugin_configuration['panes']['completion_registration'] = $pane->getConfiguration();
+    $checkout_flow_plugin->setConfiguration($checkout_flow_plugin_configuration);
+    $checkout_flow->save();
+
+    $this->drupalLogout();
+    $this->drupalGet($this->product->toUrl()->toString());
+    $this->submitForm([], 'Add to cart');
+    $cart_link = $this->getSession()->getPage()->findLink('your cart');
+    $cart_link->click();
+    $this->submitForm([], 'Checkout');
+
+    // Checkout as guest.
+    $this->assertCheckoutProgressStep('Login');
+    $this->submitForm([], 'Continue as Guest');
+    $this->assertCheckoutProgressStep('Order information');
+    $this->submitForm([
+      'contact_information[email]' => 'guest@example.com',
+      'contact_information[email_confirm]' => 'guest@example.com',
+      'billing_information[profile][address][0][address][given_name]' => $this->randomString(),
+      'billing_information[profile][address][0][address][family_name]' => $this->randomString(),
+      'billing_information[profile][address][0][address][organization]' => $this->randomString(),
+      'billing_information[profile][address][0][address][address_line1]' => $this->randomString(),
+      'billing_information[profile][address][0][address][postal_code]' => '94043',
+      'billing_information[profile][address][0][address][locality]' => 'Mountain View',
+      'billing_information[profile][address][0][address][administrative_area]' => 'CA',
+    ], 'Continue to review');
+    $this->assertCheckoutProgressStep('Review');
+    $this->assertSession()->pageTextContains('Contact information');
+    $this->assertSession()->pageTextContains('Billing information');
+    $this->assertSession()->pageTextContains('Order Summary');
+    $this->submitForm([], 'Complete checkout');
+    $this->assertSession()->pageTextContains('Your order number is 1. You can view your order on your account page when logged in.');
+
+    // Assert that the completion_registration checkout pane is shown.
+    $this->assertSession()->pageTextContains('Create an account?');
+    // Register.
+    $this->submitForm([
+      'completion_registration[register][name]' => 'User name',
+      'completion_registration[register][password][pass1]' => 'pass',
+      'completion_registration[register][password][pass2]' => 'pass',
+    ], 'Create my account');
+    // Assert that the account was created successfully.
+    $this->assertSession()->pageTextContains('Registration successful. You are now logged in.');
+
+    // Assert that a redirect had taken place.
+    $this->assertUrl('/user/3/edit');
+  }
+
+  /**
    * Tests checkout behaviour after a cart update.
    */
   public function testCheckoutFlowOnCartUpdate() {