diff --git a/modules/zencrm_entities/config/optional/taxonomy.vocabulary.contact_types.yml b/modules/zencrm_entities/config/optional/taxonomy.vocabulary.contact_types.yml
new file mode 100644
index 0000000..ec2ce9f
--- /dev/null
+++ b/modules/zencrm_entities/config/optional/taxonomy.vocabulary.contact_types.yml
@@ -0,0 +1,8 @@
+langcode: en
+status: true
+dependencies: {  }
+name: 'Contact Types'
+vid: contact_types
+description: ''
+hierarchy: 0
+weight: 0
diff --git a/modules/zencrm_entities/contact_details.page.inc b/modules/zencrm_entities/contact_details.page.inc
new file mode 100644
index 0000000..4924125
--- /dev/null
+++ b/modules/zencrm_entities/contact_details.page.inc
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Contains contact_details.page.inc.
+ *
+ * Page callback for Contact Details entities.
+ */
+
+use Drupal\Core\Render\Element;
+
+/**
+ * Prepares variables for Contact Details templates.
+ *
+ * Default template: contact_details.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - elements: An associative array containing the user information and any
+ *   - attributes: HTML attributes for the containing element.
+ */
+function template_preprocess_contact_details(array &$variables) {
+  // Fetch ContactDetails Entity Object.
+  $contact_details = $variables['elements']['#contact_details'];
+
+  // Helpful $content variable for templates.
+  foreach (Element::children($variables['elements']) as $key) {
+    $variables['content'][$key] = $variables['elements'][$key];
+  }
+}
diff --git a/modules/zencrm_entities/src/ContactDetailsAccessControlHandler.php b/modules/zencrm_entities/src/ContactDetailsAccessControlHandler.php
new file mode 100644
index 0000000..e38051e
--- /dev/null
+++ b/modules/zencrm_entities/src/ContactDetailsAccessControlHandler.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Drupal\zencrm_entities;
+
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Access\AccessResult;
+
+/**
+ * Access controller for the Contact Details entity.
+ *
+ * @see \Drupal\zencrm_entities\Entity\ContactDetails.
+ */
+class ContactDetailsAccessControlHandler extends EntityAccessControlHandler {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
+    /** @var \Drupal\zencrm_entities\Entity\ContactDetailsInterface $entity */
+    switch ($operation) {
+      case 'view':
+        if (!$entity->isPublished()) {
+          return AccessResult::allowedIfHasPermission($account, 'view unpublished contact details entities');
+        }
+        return AccessResult::allowedIfHasPermission($account, 'view published contact details entities');
+
+      case 'update':
+        return AccessResult::allowedIfHasPermission($account, 'edit contact details entities');
+
+      case 'delete':
+        return AccessResult::allowedIfHasPermission($account, 'delete contact details entities');
+    }
+
+    // Unknown operation, no opinion.
+    return AccessResult::neutral();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
+    return AccessResult::allowedIfHasPermission($account, 'add contact details entities');
+  }
+
+}
diff --git a/modules/zencrm_entities/src/ContactDetailsHtmlRouteProvider.php b/modules/zencrm_entities/src/ContactDetailsHtmlRouteProvider.php
new file mode 100644
index 0000000..55e0d14
--- /dev/null
+++ b/modules/zencrm_entities/src/ContactDetailsHtmlRouteProvider.php
@@ -0,0 +1,196 @@
+<?php
+
+namespace Drupal\zencrm_entities;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\Routing\AdminHtmlRouteProvider;
+use Symfony\Component\Routing\Route;
+
+/**
+ * Provides routes for Contact Details entities.
+ *
+ * @see \Drupal\Core\Entity\Routing\AdminHtmlRouteProvider
+ * @see \Drupal\Core\Entity\Routing\DefaultHtmlRouteProvider
+ */
+class ContactDetailsHtmlRouteProvider extends AdminHtmlRouteProvider {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRoutes(EntityTypeInterface $entity_type) {
+    $collection = parent::getRoutes($entity_type);
+
+    $entity_type_id = $entity_type->id();
+
+    if ($history_route = $this->getHistoryRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.version_history", $history_route);
+    }
+
+    if ($revision_route = $this->getRevisionRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision", $revision_route);
+    }
+
+    if ($revert_route = $this->getRevisionRevertRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision_revert", $revert_route);
+    }
+
+    if ($delete_route = $this->getRevisionDeleteRoute($entity_type)) {
+      $collection->add("entity.{$entity_type_id}.revision_delete", $delete_route);
+    }
+
+    if ($translation_route = $this->getRevisionTranslationRevertRoute($entity_type)) {
+      $collection->add("{$entity_type_id}.revision_revert_translation_confirm", $translation_route);
+    }
+
+    if ($settings_form_route = $this->getSettingsFormRoute($entity_type)) {
+      $collection->add("$entity_type_id.settings", $settings_form_route);
+    }
+
+    return $collection;
+  }
+
+  /**
+   * Gets the version history route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getHistoryRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('version-history')) {
+      $route = new Route($entity_type->getLinkTemplate('version-history'));
+      $route
+        ->setDefaults([
+          '_title' => "{$entity_type->getLabel()} revisions",
+          '_controller' => '\Drupal\zencrm_entities\Controller\ContactDetailsController::revisionOverview',
+        ])
+        ->setRequirement('_permission', 'access contact details revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision')) {
+      $route = new Route($entity_type->getLinkTemplate('revision'));
+      $route
+        ->setDefaults([
+          '_controller' => '\Drupal\zencrm_entities\Controller\ContactDetailsController::revisionShow',
+          '_title_callback' => '\Drupal\zencrm_entities\Controller\ContactDetailsController::revisionPageTitle',
+        ])
+        ->setRequirement('_permission', 'access contact details revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision revert route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionRevertRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision_revert')) {
+      $route = new Route($entity_type->getLinkTemplate('revision_revert'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\zencrm_entities\Form\ContactDetailsRevisionRevertForm',
+          '_title' => 'Revert to earlier revision',
+        ])
+        ->setRequirement('_permission', 'revert all contact details revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision delete route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionDeleteRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('revision_delete')) {
+      $route = new Route($entity_type->getLinkTemplate('revision_delete'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\zencrm_entities\Form\ContactDetailsRevisionDeleteForm',
+          '_title' => 'Delete earlier revision',
+        ])
+        ->setRequirement('_permission', 'delete all contact details revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the revision translation revert route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getRevisionTranslationRevertRoute(EntityTypeInterface $entity_type) {
+    if ($entity_type->hasLinkTemplate('translation_revert')) {
+      $route = new Route($entity_type->getLinkTemplate('translation_revert'));
+      $route
+        ->setDefaults([
+          '_form' => '\Drupal\zencrm_entities\Form\ContactDetailsRevisionRevertTranslationForm',
+          '_title' => 'Revert to earlier revision of a translation',
+        ])
+        ->setRequirement('_permission', 'revert all contact details revisions')
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+  /**
+   * Gets the settings form route.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type.
+   *
+   * @return \Symfony\Component\Routing\Route|null
+   *   The generated route, if available.
+   */
+  protected function getSettingsFormRoute(EntityTypeInterface $entity_type) {
+    if (!$entity_type->getBundleEntityType()) {
+      $route = new Route("/admin/structure/{$entity_type->id()}/settings");
+      $route
+        ->setDefaults([
+          '_form' => 'Drupal\zencrm_entities\Form\ContactDetailsSettingsForm',
+          '_title' => "{$entity_type->getLabel()} settings",
+        ])
+        ->setRequirement('_permission', $entity_type->getAdminPermission())
+        ->setOption('_admin_route', TRUE);
+
+      return $route;
+    }
+  }
+
+}
diff --git a/modules/zencrm_entities/src/ContactDetailsListBuilder.php b/modules/zencrm_entities/src/ContactDetailsListBuilder.php
new file mode 100644
index 0000000..0ede242
--- /dev/null
+++ b/modules/zencrm_entities/src/ContactDetailsListBuilder.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Drupal\zencrm_entities;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityListBuilder;
+use Drupal\Core\Link;
+
+/**
+ * Defines a class to build a listing of Contact Details entities.
+ *
+ * @ingroup zencrm_entities
+ */
+class ContactDetailsListBuilder extends EntityListBuilder {
+
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildHeader() {
+    $header['id'] = $this->t('Contact Details ID');
+    $header['name'] = $this->t('Name');
+    return $header + parent::buildHeader();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildRow(EntityInterface $entity) {
+    /* @var $entity \Drupal\zencrm_entities\Entity\ContactDetails */
+    $row['id'] = $entity->id();
+    $row['name'] = Link::createFromRoute(
+      $entity->label(),
+      'entity.contact_details.edit_form',
+      ['contact_details' => $entity->id()]
+    );
+    return $row + parent::buildRow($entity);
+  }
+
+}
diff --git a/modules/zencrm_entities/src/ContactDetailsStorage.php b/modules/zencrm_entities/src/ContactDetailsStorage.php
new file mode 100644
index 0000000..b2613f0
--- /dev/null
+++ b/modules/zencrm_entities/src/ContactDetailsStorage.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Drupal\zencrm_entities;
+
+use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\zencrm_entities\Entity\ContactDetailsInterface;
+
+/**
+ * Defines the storage handler class for Contact Details entities.
+ *
+ * This extends the base storage class, adding required special handling for
+ * Contact Details entities.
+ *
+ * @ingroup zencrm_entities
+ */
+class ContactDetailsStorage extends SqlContentEntityStorage implements ContactDetailsStorageInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function revisionIds(ContactDetailsInterface $entity) {
+    return $this->database->query(
+      'SELECT vid FROM {contact_details_revision} WHERE id=:id ORDER BY vid',
+      [':id' => $entity->id()]
+    )->fetchCol();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function userRevisionIds(AccountInterface $account) {
+    return $this->database->query(
+      'SELECT vid FROM {contact_details_field_revision} WHERE uid = :uid ORDER BY vid',
+      [':uid' => $account->id()]
+    )->fetchCol();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function countDefaultLanguageRevisions(ContactDetailsInterface $entity) {
+    return $this->database->query('SELECT COUNT(*) FROM {contact_details_field_revision} WHERE id = :id AND default_langcode = 1', [':id' => $entity->id()])
+      ->fetchField();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function clearRevisionsLanguage(LanguageInterface $language) {
+    return $this->database->update('contact_details_revision')
+      ->fields(['langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED])
+      ->condition('langcode', $language->getId())
+      ->execute();
+  }
+
+}
diff --git a/modules/zencrm_entities/src/ContactDetailsStorageInterface.php b/modules/zencrm_entities/src/ContactDetailsStorageInterface.php
new file mode 100644
index 0000000..01709f0
--- /dev/null
+++ b/modules/zencrm_entities/src/ContactDetailsStorageInterface.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\zencrm_entities;
+
+use Drupal\Core\Entity\ContentEntityStorageInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\zencrm_entities\Entity\ContactDetailsInterface;
+
+/**
+ * Defines the storage handler class for Contact Details entities.
+ *
+ * This extends the base storage class, adding required special handling for
+ * Contact Details entities.
+ *
+ * @ingroup zencrm_entities
+ */
+interface ContactDetailsStorageInterface extends ContentEntityStorageInterface {
+
+  /**
+   * Gets a list of Contact Details revision IDs for a specific Contact Details.
+   *
+   * @param \Drupal\zencrm_entities\Entity\ContactDetailsInterface $entity
+   *   The Contact Details entity.
+   *
+   * @return int[]
+   *   Contact Details revision IDs (in ascending order).
+   */
+  public function revisionIds(ContactDetailsInterface $entity);
+
+  /**
+   * Gets a list of revision IDs having a given user as Contact Details author.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The user entity.
+   *
+   * @return int[]
+   *   Contact Details revision IDs (in ascending order).
+   */
+  public function userRevisionIds(AccountInterface $account);
+
+  /**
+   * Counts the number of revisions in the default language.
+   *
+   * @param \Drupal\zencrm_entities\Entity\ContactDetailsInterface $entity
+   *   The Contact Details entity.
+   *
+   * @return int
+   *   The number of revisions in the default language.
+   */
+  public function countDefaultLanguageRevisions(ContactDetailsInterface $entity);
+
+  /**
+   * Unsets the language for all Contact Details with the given language.
+   *
+   * @param \Drupal\Core\Language\LanguageInterface $language
+   *   The language object.
+   */
+  public function clearRevisionsLanguage(LanguageInterface $language);
+
+}
diff --git a/modules/zencrm_entities/src/ContactDetailsTranslationHandler.php b/modules/zencrm_entities/src/ContactDetailsTranslationHandler.php
new file mode 100644
index 0000000..e3b4081
--- /dev/null
+++ b/modules/zencrm_entities/src/ContactDetailsTranslationHandler.php
@@ -0,0 +1,14 @@
+<?php
+
+namespace Drupal\zencrm_entities;
+
+use Drupal\content_translation\ContentTranslationHandler;
+
+/**
+ * Defines the translation handler for contact_details.
+ */
+class ContactDetailsTranslationHandler extends ContentTranslationHandler {
+
+  // Override here the needed methods from ContentTranslationHandler.
+
+}
diff --git a/modules/zencrm_entities/src/Controller/ContactDetailsController.php b/modules/zencrm_entities/src/Controller/ContactDetailsController.php
new file mode 100644
index 0000000..0c12848
--- /dev/null
+++ b/modules/zencrm_entities/src/Controller/ContactDetailsController.php
@@ -0,0 +1,163 @@
+<?php
+
+namespace Drupal\zencrm_entities\Controller;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Url;
+use Drupal\zencrm_entities\Entity\ContactDetailsInterface;
+
+/**
+ * Class ContactDetailsController.
+ *
+ *  Returns responses for Contact Details routes.
+ */
+class ContactDetailsController extends ControllerBase implements ContainerInjectionInterface {
+
+  /**
+   * Displays a Contact Details  revision.
+   *
+   * @param int $contact_details_revision
+   *   The Contact Details  revision ID.
+   *
+   * @return array
+   *   An array suitable for drupal_render().
+   */
+  public function revisionShow($contact_details_revision) {
+    $contact_details = $this->entityManager()->getStorage('contact_details')->loadRevision($contact_details_revision);
+    $view_builder = $this->entityManager()->getViewBuilder('contact_details');
+
+    return $view_builder->view($contact_details);
+  }
+
+  /**
+   * Page title callback for a Contact Details  revision.
+   *
+   * @param int $contact_details_revision
+   *   The Contact Details  revision ID.
+   *
+   * @return string
+   *   The page title.
+   */
+  public function revisionPageTitle($contact_details_revision) {
+    $contact_details = $this->entityManager()->getStorage('contact_details')->loadRevision($contact_details_revision);
+    return $this->t('Revision of %title from %date', ['%title' => $contact_details->label(), '%date' => format_date($contact_details->getRevisionCreationTime())]);
+  }
+
+  /**
+   * Generates an overview table of older revisions of a Contact Details .
+   *
+   * @param \Drupal\zencrm_entities\Entity\ContactDetailsInterface $contact_details
+   *   A Contact Details  object.
+   *
+   * @return array
+   *   An array as expected by drupal_render().
+   */
+  public function revisionOverview(ContactDetailsInterface $contact_details) {
+    $account = $this->currentUser();
+    $langcode = $contact_details->language()->getId();
+    $langname = $contact_details->language()->getName();
+    $languages = $contact_details->getTranslationLanguages();
+    $has_translations = (count($languages) > 1);
+    $contact_details_storage = $this->entityManager()->getStorage('contact_details');
+
+    $build['#title'] = $has_translations ? $this->t('@langname revisions for %title', ['@langname' => $langname, '%title' => $contact_details->label()]) : $this->t('Revisions for %title', ['%title' => $contact_details->label()]);
+    $header = [$this->t('Revision'), $this->t('Operations')];
+
+    $revert_permission = (($account->hasPermission("revert all contact details revisions") || $account->hasPermission('administer contact details entities')));
+    $delete_permission = (($account->hasPermission("delete all contact details revisions") || $account->hasPermission('administer contact details entities')));
+
+    $rows = [];
+
+    $vids = $contact_details_storage->revisionIds($contact_details);
+
+    $latest_revision = TRUE;
+
+    foreach (array_reverse($vids) as $vid) {
+      /** @var \Drupal\zencrm_entities\ContactDetailsInterface $revision */
+      $revision = $contact_details_storage->loadRevision($vid);
+      // Only show revisions that are affected by the language that is being
+      // displayed.
+      if ($revision->hasTranslation($langcode) && $revision->getTranslation($langcode)->isRevisionTranslationAffected()) {
+        $username = [
+          '#theme' => 'username',
+          '#account' => $revision->getRevisionUser(),
+        ];
+
+        // Use revision link to link to revisions that are not active.
+        $date = \Drupal::service('date.formatter')->format($revision->getRevisionCreationTime(), 'short');
+        if ($vid != $contact_details->getRevisionId()) {
+          $link = $this->l($date, new Url('entity.contact_details.revision', ['contact_details' => $contact_details->id(), 'contact_details_revision' => $vid]));
+        }
+        else {
+          $link = $contact_details->link($date);
+        }
+
+        $row = [];
+        $column = [
+          'data' => [
+            '#type' => 'inline_template',
+            '#template' => '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}',
+            '#context' => [
+              'date' => $link,
+              'username' => \Drupal::service('renderer')->renderPlain($username),
+              'message' => ['#markup' => $revision->getRevisionLogMessage(), '#allowed_tags' => Xss::getHtmlTagList()],
+            ],
+          ],
+        ];
+        $row[] = $column;
+
+        if ($latest_revision) {
+          $row[] = [
+            'data' => [
+              '#prefix' => '<em>',
+              '#markup' => $this->t('Current revision'),
+              '#suffix' => '</em>',
+            ],
+          ];
+          foreach ($row as &$current) {
+            $current['class'] = ['revision-current'];
+          }
+          $latest_revision = FALSE;
+        }
+        else {
+          $links = [];
+          if ($revert_permission) {
+            $links['revert'] = [
+              'title' => $this->t('Revert'),
+              'url' => $has_translations ?
+              Url::fromRoute('entity.contact_details.translation_revert', ['contact_details' => $contact_details->id(), 'contact_details_revision' => $vid, 'langcode' => $langcode]) :
+              Url::fromRoute('entity.contact_details.revision_revert', ['contact_details' => $contact_details->id(), 'contact_details_revision' => $vid]),
+            ];
+          }
+
+          if ($delete_permission) {
+            $links['delete'] = [
+              'title' => $this->t('Delete'),
+              'url' => Url::fromRoute('entity.contact_details.revision_delete', ['contact_details' => $contact_details->id(), 'contact_details_revision' => $vid]),
+            ];
+          }
+
+          $row[] = [
+            'data' => [
+              '#type' => 'operations',
+              '#links' => $links,
+            ],
+          ];
+        }
+
+        $rows[] = $row;
+      }
+    }
+
+    $build['contact_details_revisions_table'] = [
+      '#theme' => 'table',
+      '#rows' => $rows,
+      '#header' => $header,
+    ];
+
+    return $build;
+  }
+
+}
diff --git a/modules/zencrm_entities/src/Entity/ContactDetails.php b/modules/zencrm_entities/src/Entity/ContactDetails.php
new file mode 100644
index 0000000..caa42db
--- /dev/null
+++ b/modules/zencrm_entities/src/Entity/ContactDetails.php
@@ -0,0 +1,304 @@
+<?php
+
+namespace Drupal\zencrm_entities\Entity;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+use Drupal\Core\Entity\RevisionableContentEntityBase;
+use Drupal\Core\Entity\RevisionableInterface;
+use Drupal\Core\Entity\EntityChangedTrait;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\user\UserInterface;
+
+/**
+ * Defines the Contact Details entity.
+ *
+ * @ingroup zencrm_entities
+ *
+ * @ContentEntityType(
+ *   id = "contact_details",
+ *   label = @Translation("Contact Details"),
+ *   handlers = {
+ *     "storage" = "Drupal\zencrm_entities\ContactDetailsStorage",
+ *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "list_builder" = "Drupal\zencrm_entities\ContactDetailsListBuilder",
+ *     "views_data" = "Drupal\zencrm_entities\Entity\ContactDetailsViewsData",
+ *     "translation" = "Drupal\zencrm_entities\ContactDetailsTranslationHandler",
+ *
+ *     "form" = {
+ *       "default" = "Drupal\zencrm_entities\Form\ContactDetailsForm",
+ *       "add" = "Drupal\zencrm_entities\Form\ContactDetailsForm",
+ *       "edit" = "Drupal\zencrm_entities\Form\ContactDetailsForm",
+ *       "delete" = "Drupal\zencrm_entities\Form\ContactDetailsDeleteForm",
+ *     },
+ *     "access" = "Drupal\zencrm_entities\ContactDetailsAccessControlHandler",
+ *     "route_provider" = {
+ *       "html" = "Drupal\zencrm_entities\ContactDetailsHtmlRouteProvider",
+ *     },
+ *   },
+ *   base_table = "contact_details",
+ *   data_table = "contact_details_field_data",
+ *   revision_table = "contact_details_revision",
+ *   revision_data_table = "contact_details_field_revision",
+ *   translatable = TRUE,
+ *   admin_permission = "administer contact details entities",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "revision" = "vid",
+ *     "label" = "name",
+ *     "uuid" = "uuid",
+ *     "uid" = "user_id",
+ *     "langcode" = "langcode",
+ *     "status" = "status",
+ *   },
+ *   links = {
+ *     "canonical" = "/zencrm/contact_details/{contact_details}",
+ *     "add-form" = "/zencrm/contact_details/add",
+ *     "edit-form" = "/zencrm/contact_details/{contact_details}/edit",
+ *     "delete-form" = "/zencrm/contact_details/{contact_details}/delete",
+ *     "version-history" = "/zencrm/contact_details/{contact_details}/revisions",
+ *     "revision" = "/zencrm/contact_details/{contact_details}/revisions/{contact_details_revision}/view",
+ *     "revision_revert" = "/zencrm/contact_details/{contact_details}/revisions/{contact_details_revision}/revert",
+ *     "revision_delete" = "/zencrm/contact_details/{contact_details}/revisions/{contact_details_revision}/delete",
+ *     "translation_revert" = "/zencrm/contact_details/{contact_details}/revisions/{contact_details_revision}/revert/{langcode}",
+ *     "collection" = "/zencrm/contact_details",
+ *   },
+ *   field_ui_base_route = "contact_details.settings"
+ * )
+ */
+class ContactDetails extends RevisionableContentEntityBase implements ContactDetailsInterface {
+
+  use EntityChangedTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function preCreate(EntityStorageInterface $storage_controller, array &$values) {
+    parent::preCreate($storage_controller, $values);
+    $values += [
+      'user_id' => \Drupal::currentUser()->id(),
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function urlRouteParameters($rel) {
+    $uri_route_parameters = parent::urlRouteParameters($rel);
+
+    if ($rel === 'revision_revert' && $this instanceof RevisionableInterface) {
+      $uri_route_parameters[$this->getEntityTypeId() . '_revision'] = $this->getRevisionId();
+    }
+    elseif ($rel === 'revision_delete' && $this instanceof RevisionableInterface) {
+      $uri_route_parameters[$this->getEntityTypeId() . '_revision'] = $this->getRevisionId();
+    }
+
+    return $uri_route_parameters;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function preSave(EntityStorageInterface $storage) {
+    parent::preSave($storage);
+
+    foreach (array_keys($this->getTranslationLanguages()) as $langcode) {
+      $translation = $this->getTranslation($langcode);
+
+      // If no owner has been set explicitly, make the anonymous user the owner.
+      if (!$translation->getOwner()) {
+        $translation->setOwnerId(0);
+      }
+    }
+
+    // If no revision author has been set explicitly, make the contact_details owner the
+    // revision author.
+    if (!$this->getRevisionUser()) {
+      $this->setRevisionUserId($this->getOwnerId());
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getName() {
+    return $this->get('name')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setName($name) {
+    $this->set('name', $name);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCreatedTime() {
+    return $this->get('created')->value;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setCreatedTime($timestamp) {
+    $this->set('created', $timestamp);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOwner() {
+    return $this->get('user_id')->entity;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getOwnerId() {
+    return $this->get('user_id')->target_id;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setOwnerId($uid) {
+    $this->set('user_id', $uid);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setOwner(UserInterface $account) {
+    $this->set('user_id', $account->id());
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isPublished() {
+    return (bool) $this->getEntityKey('status');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setPublished($published) {
+    $this->set('status', $published ? TRUE : FALSE);
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
+    $fields = parent::baseFieldDefinitions($entity_type);
+
+    $fields['user_id'] = BaseFieldDefinition::create('entity_reference')
+      ->setLabel(t('Authored by'))
+      ->setDescription(t('The user ID of author of the Contact Details entity.'))
+      ->setRevisionable(TRUE)
+      ->setSetting('target_type', 'user')
+      ->setSetting('handler', 'default')
+      ->setTranslatable(TRUE)
+      ->setDisplayOptions('view', [
+        'label' => 'hidden',
+        'type' => 'author',
+        'weight' => 0,
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'entity_reference_autocomplete',
+        'weight' => 5,
+        'settings' => [
+          'match_operator' => 'CONTAINS',
+          'size' => '60',
+          'autocomplete_type' => 'tags',
+          'placeholder' => '',
+        ],
+      ])
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE);
+
+    $fields['person'] = BaseFieldDefinition::create('entity_reference')
+      ->setLabel(t('Person'))
+      ->setDescription(t('The person this profile is of.'))
+      ->setSetting('target_type', 'person')
+      ->setSetting('handler', 'views')
+      ->setSetting('handler_settings', [
+        'view' => [
+          'view_name' => 'persons',            
+          'display_name' => 'entity_reference_1',
+          'arguments' => []
+        ]
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'entity_reference_autocomplete',
+        'weight' => 5,
+        'settings' => [
+          'match_operator' => 'CONTAINS',
+          'size' => '60',
+          'autocomplete_type' => 'tags',
+          'placeholder' => '',
+        ],
+      ])
+      ->setDisplayOptions('view', [
+        'label' => 'above',
+        'weight' => 0,
+      ]);
+
+    $fields['name'] = BaseFieldDefinition::create('string')
+      ->setLabel(t('Name'))
+      ->setDescription(t('The name of the Contact Details entity.'))
+      ->setRevisionable(TRUE)
+      ->setSettings([
+        'max_length' => 50,
+        'text_processing' => 0,
+      ])
+      ->setDefaultValue('')
+      ->setDisplayOptions('view', [
+        'label' => 'above',
+        'type' => 'string',
+        'weight' => -4,
+      ])
+      ->setDisplayOptions('form', [
+        'type' => 'string_textfield',
+        'weight' => -4,
+      ])
+      ->setDisplayConfigurable('form', TRUE)
+      ->setDisplayConfigurable('view', TRUE)
+      ->setRequired(TRUE);
+
+    $fields['status'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Publishing status'))
+      ->setDescription(t('A boolean indicating whether the Contact Details is published.'))
+      ->setRevisionable(TRUE)
+      ->setDefaultValue(TRUE)
+      ->setDisplayOptions('form', [
+        'type' => 'boolean_checkbox',
+        'weight' => -3,
+      ]);
+
+    $fields['created'] = BaseFieldDefinition::create('created')
+      ->setLabel(t('Created'))
+      ->setDescription(t('The time that the entity was created.'));
+
+    $fields['changed'] = BaseFieldDefinition::create('changed')
+      ->setLabel(t('Changed'))
+      ->setDescription(t('The time that the entity was last edited.'));
+
+    $fields['revision_translation_affected'] = BaseFieldDefinition::create('boolean')
+      ->setLabel(t('Revision translation affected'))
+      ->setDescription(t('Indicates if the last edit of a translation belongs to current revision.'))
+      ->setReadOnly(TRUE)
+      ->setRevisionable(TRUE)
+      ->setTranslatable(TRUE);
+
+    return $fields;
+  }
+
+}
diff --git a/modules/zencrm_entities/src/Entity/ContactDetailsInterface.php b/modules/zencrm_entities/src/Entity/ContactDetailsInterface.php
new file mode 100644
index 0000000..583ef18
--- /dev/null
+++ b/modules/zencrm_entities/src/Entity/ContactDetailsInterface.php
@@ -0,0 +1,116 @@
+<?php
+
+namespace Drupal\zencrm_entities\Entity;
+
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\RevisionLogInterface;
+use Drupal\Core\Entity\EntityChangedInterface;
+use Drupal\user\EntityOwnerInterface;
+
+/**
+ * Provides an interface for defining Contact Details entities.
+ *
+ * @ingroup zencrm_entities
+ */
+interface ContactDetailsInterface extends ContentEntityInterface, RevisionLogInterface, EntityChangedInterface, EntityOwnerInterface {
+
+  // Add get/set methods for your configuration properties here.
+
+  /**
+   * Gets the Contact Details name.
+   *
+   * @return string
+   *   Name of the Contact Details.
+   */
+  public function getName();
+
+  /**
+   * Sets the Contact Details name.
+   *
+   * @param string $name
+   *   The Contact Details name.
+   *
+   * @return \Drupal\zencrm_entities\Entity\ContactDetailsInterface
+   *   The called Contact Details entity.
+   */
+  public function setName($name);
+
+  /**
+   * Gets the Contact Details creation timestamp.
+   *
+   * @return int
+   *   Creation timestamp of the Contact Details.
+   */
+  public function getCreatedTime();
+
+  /**
+   * Sets the Contact Details creation timestamp.
+   *
+   * @param int $timestamp
+   *   The Contact Details creation timestamp.
+   *
+   * @return \Drupal\zencrm_entities\Entity\ContactDetailsInterface
+   *   The called Contact Details entity.
+   */
+  public function setCreatedTime($timestamp);
+
+  /**
+   * Returns the Contact Details published status indicator.
+   *
+   * Unpublished Contact Details are only visible to restricted users.
+   *
+   * @return bool
+   *   TRUE if the Contact Details is published.
+   */
+  public function isPublished();
+
+  /**
+   * Sets the published status of a Contact Details.
+   *
+   * @param bool $published
+   *   TRUE to set this Contact Details to published, FALSE to set it to unpublished.
+   *
+   * @return \Drupal\zencrm_entities\Entity\ContactDetailsInterface
+   *   The called Contact Details entity.
+   */
+  public function setPublished($published);
+
+  /**
+   * Gets the Contact Details revision creation timestamp.
+   *
+   * @return int
+   *   The UNIX timestamp of when this revision was created.
+   */
+  public function getRevisionCreationTime();
+
+  /**
+   * Sets the Contact Details revision creation timestamp.
+   *
+   * @param int $timestamp
+   *   The UNIX timestamp of when this revision was created.
+   *
+   * @return \Drupal\zencrm_entities\Entity\ContactDetailsInterface
+   *   The called Contact Details entity.
+   */
+  public function setRevisionCreationTime($timestamp);
+
+  /**
+   * Gets the Contact Details revision author.
+   *
+   * @return \Drupal\user\UserInterface
+   *   The user entity for the revision author.
+   */
+  public function getRevisionUser();
+
+  /**
+   * Sets the Contact Details revision author.
+   *
+   * @param int $uid
+   *   The user ID of the revision author.
+   *
+   * @return \Drupal\zencrm_entities\Entity\ContactDetailsInterface
+   *   The called Contact Details entity.
+   */
+  public function setRevisionUserId($uid);
+
+}
diff --git a/modules/zencrm_entities/src/Entity/ContactDetailsViewsData.php b/modules/zencrm_entities/src/Entity/ContactDetailsViewsData.php
new file mode 100644
index 0000000..14c6b02
--- /dev/null
+++ b/modules/zencrm_entities/src/Entity/ContactDetailsViewsData.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\zencrm_entities\Entity;
+
+use Drupal\views\EntityViewsData;
+
+/**
+ * Provides Views data for Contact Details entities.
+ */
+class ContactDetailsViewsData extends EntityViewsData {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getViewsData() {
+    $data = parent::getViewsData();
+
+    // Additional information for Views integration, such as table joins, can be
+    // put here.
+
+    return $data;
+  }
+
+}
diff --git a/modules/zencrm_entities/src/Form/ContactDetailsDeleteForm.php b/modules/zencrm_entities/src/Form/ContactDetailsDeleteForm.php
new file mode 100644
index 0000000..6000b68
--- /dev/null
+++ b/modules/zencrm_entities/src/Form/ContactDetailsDeleteForm.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Drupal\zencrm_entities\Form;
+
+use Drupal\Core\Entity\ContentEntityDeleteForm;
+
+/**
+ * Provides a form for deleting Contact Details entities.
+ *
+ * @ingroup zencrm_entities
+ */
+class ContactDetailsDeleteForm extends ContentEntityDeleteForm {
+
+
+}
diff --git a/modules/zencrm_entities/src/Form/ContactDetailsForm.php b/modules/zencrm_entities/src/Form/ContactDetailsForm.php
new file mode 100644
index 0000000..9a62a45
--- /dev/null
+++ b/modules/zencrm_entities/src/Form/ContactDetailsForm.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace Drupal\zencrm_entities\Form;
+
+use Drupal\Core\Entity\ContentEntityForm;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Form controller for Contact Details edit forms.
+ *
+ * @ingroup zencrm_entities
+ */
+class ContactDetailsForm extends ContentEntityForm {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    /* @var $entity \Drupal\zencrm_entities\Entity\ContactDetails */
+    $form = parent::buildForm($form, $form_state);
+
+    if (!$this->entity->isNew()) {
+      $form['new_revision'] = [
+        '#type' => 'checkbox',
+        '#title' => $this->t('Create new revision'),
+        '#default_value' => FALSE,
+        '#weight' => 10,
+      ];
+    }
+
+    $entity = $this->entity;
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function save(array $form, FormStateInterface $form_state) {
+    $entity = $this->entity;
+
+    // Save as a new revision if requested to do so.
+    if (!$form_state->isValueEmpty('new_revision') && $form_state->getValue('new_revision') != FALSE) {
+      $entity->setNewRevision();
+
+      // If a new revision is created, save the current user as revision author.
+      $entity->setRevisionCreationTime(REQUEST_TIME);
+      $entity->setRevisionUserId(\Drupal::currentUser()->id());
+    }
+    else {
+      $entity->setNewRevision(FALSE);
+    }
+
+    $status = parent::save($form, $form_state);
+
+    switch ($status) {
+      case SAVED_NEW:
+        drupal_set_message($this->t('Created the %label Contact Details.', [
+          '%label' => $entity->label(),
+        ]));
+        break;
+
+      default:
+        drupal_set_message($this->t('Saved the %label Contact Details.', [
+          '%label' => $entity->label(),
+        ]));
+    }
+    $form_state->setRedirect('entity.contact_details.canonical', ['contact_details' => $entity->id()]);
+  }
+
+}
diff --git a/modules/zencrm_entities/src/Form/ContactDetailsRevisionDeleteForm.php b/modules/zencrm_entities/src/Form/ContactDetailsRevisionDeleteForm.php
new file mode 100644
index 0000000..4aa9dae
--- /dev/null
+++ b/modules/zencrm_entities/src/Form/ContactDetailsRevisionDeleteForm.php
@@ -0,0 +1,123 @@
+<?php
+
+namespace Drupal\zencrm_entities\Form;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for deleting a Contact Details revision.
+ *
+ * @ingroup zencrm_entities
+ */
+class ContactDetailsRevisionDeleteForm extends ConfirmFormBase {
+
+
+  /**
+   * The Contact Details revision.
+   *
+   * @var \Drupal\zencrm_entities\Entity\ContactDetailsInterface
+   */
+  protected $revision;
+
+  /**
+   * The Contact Details storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $ContactDetailsStorage;
+
+  /**
+   * The database connection.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $connection;
+
+  /**
+   * Constructs a new ContactDetailsRevisionDeleteForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The entity storage.
+   * @param \Drupal\Core\Database\Connection $connection
+   *   The database connection.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, Connection $connection) {
+    $this->ContactDetailsStorage = $entity_storage;
+    $this->connection = $connection;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    $entity_manager = $container->get('entity.manager');
+    return new static(
+      $entity_manager->getStorage('contact_details'),
+      $container->get('database')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'contact_details_revision_delete_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to delete the revision from %revision-date?', ['%revision-date' => format_date($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.contact_details.version_history', ['contact_details' => $this->revision->id()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return t('Delete');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $contact_details_revision = NULL) {
+    $this->revision = $this->ContactDetailsStorage->loadRevision($contact_details_revision);
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->ContactDetailsStorage->deleteRevision($this->revision->getRevisionId());
+
+    $this->logger('content')->notice('Contact Details: deleted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+    drupal_set_message(t('Revision from %revision-date of Contact Details %title has been deleted.', ['%revision-date' => format_date($this->revision->getRevisionCreationTime()), '%title' => $this->revision->label()]));
+    $form_state->setRedirect(
+      'entity.contact_details.canonical',
+       ['contact_details' => $this->revision->id()]
+    );
+    if ($this->connection->query('SELECT COUNT(DISTINCT vid) FROM {contact_details_field_revision} WHERE id = :id', [':id' => $this->revision->id()])->fetchField() > 1) {
+      $form_state->setRedirect(
+        'entity.contact_details.version_history',
+         ['contact_details' => $this->revision->id()]
+      );
+    }
+  }
+
+}
diff --git a/modules/zencrm_entities/src/Form/ContactDetailsRevisionRevertForm.php b/modules/zencrm_entities/src/Form/ContactDetailsRevisionRevertForm.php
new file mode 100644
index 0000000..6063050
--- /dev/null
+++ b/modules/zencrm_entities/src/Form/ContactDetailsRevisionRevertForm.php
@@ -0,0 +1,149 @@
+<?php
+
+namespace Drupal\zencrm_entities\Form;
+
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Drupal\zencrm_entities\Entity\ContactDetailsInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for reverting a Contact Details revision.
+ *
+ * @ingroup zencrm_entities
+ */
+class ContactDetailsRevisionRevertForm extends ConfirmFormBase {
+
+
+  /**
+   * The Contact Details revision.
+   *
+   * @var \Drupal\zencrm_entities\Entity\ContactDetailsInterface
+   */
+  protected $revision;
+
+  /**
+   * The Contact Details storage.
+   *
+   * @var \Drupal\Core\Entity\EntityStorageInterface
+   */
+  protected $ContactDetailsStorage;
+
+  /**
+   * The date formatter service.
+   *
+   * @var \Drupal\Core\Datetime\DateFormatterInterface
+   */
+  protected $dateFormatter;
+
+  /**
+   * Constructs a new ContactDetailsRevisionRevertForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The Contact Details storage.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter service.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter) {
+    $this->ContactDetailsStorage = $entity_storage;
+    $this->dateFormatter = $date_formatter;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('contact_details'),
+      $container->get('date.formatter')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'contact_details_revision_revert_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to revert to the revision from %revision-date?', ['%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getCancelUrl() {
+    return new Url('entity.contact_details.version_history', ['contact_details' => $this->revision->id()]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfirmText() {
+    return t('Revert');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $contact_details_revision = NULL) {
+    $this->revision = $this->ContactDetailsStorage->loadRevision($contact_details_revision);
+    $form = parent::buildForm($form, $form_state);
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // The revision timestamp will be updated when the revision is saved. Keep
+    // the original one for the confirmation message.
+    $original_revision_timestamp = $this->revision->getRevisionCreationTime();
+
+    $this->revision = $this->prepareRevertedRevision($this->revision, $form_state);
+    $this->revision->revision_log = t('Copy of the revision from %date.', ['%date' => $this->dateFormatter->format($original_revision_timestamp)]);
+    $this->revision->save();
+
+    $this->logger('content')->notice('Contact Details: reverted %title revision %revision.', ['%title' => $this->revision->label(), '%revision' => $this->revision->getRevisionId()]);
+    drupal_set_message(t('Contact Details %title has been reverted to the revision from %revision-date.', ['%title' => $this->revision->label(), '%revision-date' => $this->dateFormatter->format($original_revision_timestamp)]));
+    $form_state->setRedirect(
+      'entity.contact_details.version_history',
+      ['contact_details' => $this->revision->id()]
+    );
+  }
+
+  /**
+   * Prepares a revision to be reverted.
+   *
+   * @param \Drupal\zencrm_entities\Entity\ContactDetailsInterface $revision
+   *   The revision to be reverted.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return \Drupal\zencrm_entities\Entity\ContactDetailsInterface
+   *   The prepared revision ready to be stored.
+   */
+  protected function prepareRevertedRevision(ContactDetailsInterface $revision, FormStateInterface $form_state) {
+    $revision->setNewRevision();
+    $revision->isDefaultRevision(TRUE);
+    $revision->setRevisionCreationTime(REQUEST_TIME);
+
+    return $revision;
+  }
+
+}
diff --git a/modules/zencrm_entities/src/Form/ContactDetailsRevisionRevertTranslationForm.php b/modules/zencrm_entities/src/Form/ContactDetailsRevisionRevertTranslationForm.php
new file mode 100644
index 0000000..2bcc6ff
--- /dev/null
+++ b/modules/zencrm_entities/src/Form/ContactDetailsRevisionRevertTranslationForm.php
@@ -0,0 +1,115 @@
+<?php
+
+namespace Drupal\zencrm_entities\Form;
+
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\zencrm_entities\Entity\ContactDetailsInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for reverting a Contact Details revision for a single translation.
+ *
+ * @ingroup zencrm_entities
+ */
+class ContactDetailsRevisionRevertTranslationForm extends ContactDetailsRevisionRevertForm {
+
+
+  /**
+   * The language to be reverted.
+   *
+   * @var string
+   */
+  protected $langcode;
+
+  /**
+   * The language manager.
+   *
+   * @var \Drupal\Core\Language\LanguageManagerInterface
+   */
+  protected $languageManager;
+
+  /**
+   * Constructs a new ContactDetailsRevisionRevertTranslationForm.
+   *
+   * @param \Drupal\Core\Entity\EntityStorageInterface $entity_storage
+   *   The Contact Details storage.
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter service.
+   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
+   *   The language manager.
+   */
+  public function __construct(EntityStorageInterface $entity_storage, DateFormatterInterface $date_formatter, LanguageManagerInterface $language_manager) {
+    parent::__construct($entity_storage, $date_formatter);
+    $this->languageManager = $language_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity.manager')->getStorage('contact_details'),
+      $container->get('date.formatter'),
+      $container->get('language_manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'contact_details_revision_revert_translation_confirm';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getQuestion() {
+    return t('Are you sure you want to revert @language translation to the revision from %revision-date?', ['@language' => $this->languageManager->getLanguageName($this->langcode), '%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime())]);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state, $contact_details_revision = NULL, $langcode = NULL) {
+    $this->langcode = $langcode;
+    $form = parent::buildForm($form, $form_state, $contact_details_revision);
+
+    $form['revert_untranslated_fields'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Revert content shared among translations'),
+      '#default_value' => FALSE,
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function prepareRevertedRevision(ContactDetailsInterface $revision, FormStateInterface $form_state) {
+    $revert_untranslated_fields = $form_state->getValue('revert_untranslated_fields');
+
+    /** @var \Drupal\zencrm_entities\Entity\ContactDetailsInterface $default_revision */
+    $latest_revision = $this->ContactDetailsStorage->load($revision->id());
+    $latest_revision_translation = $latest_revision->getTranslation($this->langcode);
+
+    $revision_translation = $revision->getTranslation($this->langcode);
+
+    foreach ($latest_revision_translation->getFieldDefinitions() as $field_name => $definition) {
+      if ($definition->isTranslatable() || $revert_untranslated_fields) {
+        $latest_revision_translation->set($field_name, $revision_translation->get($field_name)->getValue());
+      }
+    }
+
+    $latest_revision_translation->setNewRevision();
+    $latest_revision_translation->isDefaultRevision(TRUE);
+    $revision->setRevisionCreationTime(REQUEST_TIME);
+
+    return $latest_revision_translation;
+  }
+
+}
diff --git a/modules/zencrm_entities/src/Form/ContactDetailsSettingsForm.php b/modules/zencrm_entities/src/Form/ContactDetailsSettingsForm.php
new file mode 100644
index 0000000..315d7b5
--- /dev/null
+++ b/modules/zencrm_entities/src/Form/ContactDetailsSettingsForm.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\zencrm_entities\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Class ContactDetailsSettingsForm.
+ *
+ * @ingroup zencrm_entities
+ */
+class ContactDetailsSettingsForm extends FormBase {
+
+  /**
+   * Returns a unique string identifying the form.
+   *
+   * @return string
+   *   The unique string identifying the form.
+   */
+  public function getFormId() {
+    return 'contactdetails_settings';
+  }
+
+  /**
+   * Form submission handler.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    // Empty implementation of the abstract submit class.
+  }
+
+  /**
+   * Defines the settings form for Contact Details entities.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return array
+   *   Form definition array.
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['contactdetails_settings']['#markup'] = 'Settings form for Contact Details entities. Manage field settings here.';
+    return $form;
+  }
+
+}
diff --git a/modules/zencrm_entities/templates/contact_details.html.twig b/modules/zencrm_entities/templates/contact_details.html.twig
new file mode 100644
index 0000000..45a0307
--- /dev/null
+++ b/modules/zencrm_entities/templates/contact_details.html.twig
@@ -0,0 +1,22 @@
+{#
+/**
+ * @file contact_details.html.twig
+ * Default theme implementation to present Contact Details data.
+ *
+ * This template is used when viewing Contact Details pages.
+ *
+ *
+ * Available variables:
+ * - content: A list of content items. Use 'content' to print all content, or
+ * - attributes: HTML attributes for the container element.
+ *
+ * @see template_preprocess_contact_details()
+ *
+ * @ingroup themeable
+ */
+#}
+<div{{ attributes.addClass('contact_details') }}>
+  {% if content %}
+    {{- content -}}
+  {% endif %}
+</div>
diff --git a/modules/zencrm_entities/zencrm_entities.links.action.yml b/modules/zencrm_entities/zencrm_entities.links.action.yml
index 142652b..a4527ce 100644
--- a/modules/zencrm_entities/zencrm_entities.links.action.yml
+++ b/modules/zencrm_entities/zencrm_entities.links.action.yml
@@ -14,3 +14,8 @@ entity.profile_type.add_form:
   appears_on:
     - entity.profile_type.collection
 
+entity.contact_details.add_form:
+  route_name: entity.contact_details.add_form
+  title: 'Add Contact Details'
+  appears_on:
+    - entity.contact_details.collection
diff --git a/modules/zencrm_entities/zencrm_entities.links.menu.yml b/modules/zencrm_entities/zencrm_entities.links.menu.yml
index c3f4d63..87ab050 100644
--- a/modules/zencrm_entities/zencrm_entities.links.menu.yml
+++ b/modules/zencrm_entities/zencrm_entities.links.menu.yml
@@ -30,3 +30,17 @@ entity.profile_type.collection:
   parent: system.admin_structure
   weight: 99
 
+
+# Contact Details menu items definition
+entity.contact_details.collection:
+  title: 'Contact Details list'
+  route_name: entity.contact_details.collection
+  description: 'List Contact Details entities'
+  parent: system.admin_structure
+  weight: 100
+
+contact_details.admin.structure.settings:
+  title: 'Contact Details settings'
+  description: 'Configure Contact Details entities'
+  route_name: contact_details.settings
+  parent: system.admin_structure
diff --git a/modules/zencrm_entities/zencrm_entities.links.task.yml b/modules/zencrm_entities/zencrm_entities.links.task.yml
index 6ce894f..601e202 100644
--- a/modules/zencrm_entities/zencrm_entities.links.task.yml
+++ b/modules/zencrm_entities/zencrm_entities.links.task.yml
@@ -48,3 +48,30 @@ entity.profile.delete_form:
   title: Delete
   weight: 10
 
+# Contact Details routing definition
+contact_details.settings_tab:
+  route_name: contact_details.settings
+  title: 'Settings'
+  base_route: contact_details.settings
+
+entity.contact_details.canonical:
+  route_name: entity.contact_details.canonical
+  base_route: entity.contact_details.canonical
+  title: 'View'
+
+entity.contact_details.edit_form:
+  route_name: entity.contact_details.edit_form
+  base_route: entity.contact_details.canonical
+  title: 'Edit'
+
+entity.contact_details.version_history:
+  route_name: entity.contact_details.version_history
+  base_route: entity.contact_details.canonical
+  title: 'Revisions'
+
+entity.contact_details.delete_form:
+  route_name:  entity.contact_details.delete_form
+  base_route:  entity.contact_details.canonical
+  title: Delete
+  weight: 10
+
diff --git a/modules/zencrm_entities/zencrm_entities.permissions.yml b/modules/zencrm_entities/zencrm_entities.permissions.yml
index 5e56d93..363d994 100644
--- a/modules/zencrm_entities/zencrm_entities.permissions.yml
+++ b/modules/zencrm_entities/zencrm_entities.permissions.yml
@@ -58,3 +58,33 @@ revert all profile revisions:
 delete all profile revisions:
   title: 'Delete all revisions'
   description: 'Role requires permission to <em>view Profile revisions</em> and <em>delete rights</em> for profile entities in question or <em>administer profile entities</em>.'
+add contact details entities:
+  title: 'Create new Contact Details entities'
+
+administer contact details entities:
+  title: 'Administer Contact Details entities'
+  description: 'Allow to access the administration form to configure Contact Details entities.'
+  restrict access: true
+
+delete contact details entities:
+  title: 'Delete Contact Details entities'
+
+edit contact details entities:
+  title: 'Edit Contact Details entities'
+
+view published contact details entities:
+  title: 'View published Contact Details entities'
+
+view unpublished contact details entities:
+  title: 'View unpublished Contact Details entities'
+
+view all contact details revisions:
+  title: 'View all Contact Details revisions'
+
+revert all contact details revisions:
+  title: 'Revert all Contact Details revisions'
+  description: 'Role requires permission <em>view Contact Details revisions</em> and <em>edit rights</em> for contact details entities in question or <em>administer contact details entities</em>.'
+
+delete all contact details revisions:
+  title: 'Delete all revisions'
+  description: 'Role requires permission to <em>view Contact Details revisions</em> and <em>delete rights</em> for contact details entities in question or <em>administer contact details entities</em>.'