diff --git a/CHANGELOG.txt b/CHANGELOG.txt
new file mode 100755
index 0000000..cab8e6b
--- /dev/null
+++ b/CHANGELOG.txt
@@ -0,0 +1,26 @@
+--- version 2.0.0 ---
+  Ported base functions and logic
+  Added libraries
+  Attached JS with behaviour
+  Implemented Drupal coding standards
+
+--- version 1.0.4 ---
+  Added license routing
+  Added license form
+  Added licence number validation
+  Added user login and license number to default configurations
+
+--- version 1.0.3 ---
+  Added configuration
+  Remove configuration on module uninstalling
+
+--- version 1.0.2 ---
+  All defines replaced by const
+  Added settings form
+
+--- version 1.0.1 ---
+  Added permissions
+  Added routing for settings form
+
+--- version 1.0.0 ---
+  Added composer.json with information
diff --git a/README.txt b/README.txt
new file mode 100755
index 0000000..cf74868
--- /dev/null
+++ b/README.txt
@@ -0,0 +1,12 @@
+Installing LiveChat in Drupal:
+1. Upload `livechat` directory to `/sites/all/modules/`.
+2. Open your Drupal website.
+3. Go to "Administration > Modules" and activate `LiveChat`
+module (under `Other` category).
+4. Go to "Administration > Configuration > Services > LiveChat"
+and follow the instructions.
+
+---
+
+For further information, please visit our website:
+www.livechatinc.com
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..0df75c2
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,10 @@
+{
+  "name": "drupal/livechat",
+  "description": "LiveChat integration.",
+  "type": "drupal-module",
+  "homepage": "https://www.drupal.org/project/livechat",
+  "support": {
+    "issues": "https://www.drupal.org/project/issues/livechat"
+  },
+  "license": "GPL-2.0"
+}
diff --git a/config/install/livechat.configuration.yml b/config/install/livechat.configuration.yml
new file mode 100644
index 0000000..9f27425
--- /dev/null
+++ b/config/install/livechat.configuration.yml
@@ -0,0 +1,7 @@
+livechat_visibility: 0
+livechat_pages: "/admin\n/admin/*\n/node/add*\n/node/*/*\n/user/*/*\n"
+livechat_exclude_system_paths: 1
+livechat_group: ''
+livechat_enabled: 1
+livechat_login: ''
+livechat_license: ''
diff --git a/js/livechat.js b/js/livechat.js
new file mode 100755
index 0000000..fbefb16
--- /dev/null
+++ b/js/livechat.js
@@ -0,0 +1,18 @@
+(function ($, Drupal, drupalSettings) {
+  'use strict';
+
+  Drupal.behaviors.initLiveChat = {
+    attach: function (context, settings) {
+      if (drupalSettings.LiveChat) {
+        $('body').once('initLiveChat').each(function() {
+          window.__lc = drupalSettings.LiveChat || {};
+
+          var lc = document.createElement('script'); lc.type = 'text/javascript'; lc.async = true;
+          lc.src = ('https:' === document.location.protocol ? 'https://' : 'http://') + 'cdn.livechatinc.com/tracking.js';
+          var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(lc, s);
+        });
+      }
+    }
+  };
+
+})(jQuery, Drupal, drupalSettings);
diff --git a/livechat.info.yml b/livechat.info.yml
new file mode 100644
index 0000000..a8a186b
--- /dev/null
+++ b/livechat.info.yml
@@ -0,0 +1,5 @@
+name: LiveChat
+description: LiveChat integration.
+core: 8.x
+type: module
+configure: livechat.settings
\ No newline at end of file
diff --git a/livechat.install b/livechat.install
new file mode 100755
index 0000000..2baa63d
--- /dev/null
+++ b/livechat.install
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * @file
+ * Installation file for the LiveChat module.
+ */
+
+use Drupal\Core\Url;
+
+function livechat_requirements($phase) {
+  $requirements = [];
+
+  if ($phase == 'runtime') {
+    // Raise warning if a LiveChat license has not been installed yet.
+    if (!livechat_is_installed()) {
+      $requirements['livechat'] = [
+        'title' => t('LiveChat'),
+        'description' => t('A LiveChat license has not been installed. Please go to <a href="@url">LiveChat settings</a>.', [
+          '@url' => Url::fromRoute('livechat.license')->toString(),
+        ]),
+        'severity' => REQUIREMENT_ERROR,
+        'value' => t('Not configured'),
+      ];
+    }
+  }
+
+  return $requirements;
+}
+
+/**
+ * Implements hook_uninstall().
+ */
+function livechat_uninstall() {
+  $config_factory = \Drupal::configFactory();
+  $config_factory->getEditable('livechat.configuration')->delete();
+}
diff --git a/livechat.libraries.yml b/livechat.libraries.yml
new file mode 100644
index 0000000..74b91ab
--- /dev/null
+++ b/livechat.libraries.yml
@@ -0,0 +1,4 @@
+livechat:
+  version: 1.x
+  js:
+    js/livechat.js: {}
diff --git a/livechat.links.menu.yml b/livechat.links.menu.yml
new file mode 100644
index 0000000..33dde99
--- /dev/null
+++ b/livechat.links.menu.yml
@@ -0,0 +1,5 @@
+livechat.settings:
+  title: LiveChat
+  description: 'Integrate LiveChat with your website.'
+  route_name: livechat.settings
+  parent: system.admin_config_services
diff --git a/livechat.links.task.yml b/livechat.links.task.yml
new file mode 100644
index 0000000..0a1e4ef
--- /dev/null
+++ b/livechat.links.task.yml
@@ -0,0 +1,9 @@
+livechat.settings_tab:
+  route_name: livechat.settings
+  title: 'Settings'
+  base_route: livechat.settings
+
+livechat.license_tab:
+  route_name: livechat.license
+  title: 'License'
+  base_route: livechat.settings
diff --git a/livechat.module b/livechat.module
new file mode 100644
index 0000000..dec4902
--- /dev/null
+++ b/livechat.module
@@ -0,0 +1,176 @@
+<?php
+
+/**
+ * @file
+ * LiveChat module.
+ */
+
+use Drupal\Component\Utility\Unicode;
+
+/**
+ * LiveChat configuration name.
+ */
+const LIVECHAT_CONFIGURATION_NAME = 'livechat.configuration';
+
+/**
+ * API path for getting license number by login.
+ */
+const LIVECHAT_API_LICENSE_NUMBER = 'https://api.livechatinc.com/license/number';
+
+/**
+ * Shows LiveChat on every page except the listed pages.
+ */
+const LIVECHAT_VISIBILITY_NOTLISTED = 0;
+
+/**
+ * Shows LiveChat on only the listed pages.
+ */
+const LIVECHAT_VISIBILITY_LISTED = 1;
+
+/**
+ * System paths that LiveChat can be set to always exclude.
+ *
+ * @TODO: Need to test. Maybe need to add trailing slash to path.
+ */
+const LIVECHAT_VISIBILITY_SYSTEM_PATHS = "batch\nfile/ajax/*\nsystem/ajax\nadmin_menu/*\njs/admin_menu/*";
+
+/**
+ * Implements hook_page_attachments().
+ */
+function livechat_page_attachments(array &$attachments) {
+  $configs = livechat_configs();
+  if (!empty($configs->get('livechat_enabled'))) {
+    // Validate permissions for current user and visibility for current path.
+    $user = \Drupal::currentUser();
+    if ($user->hasPermission('use livechat') && livechat_check_visibility()) {
+      $license = $configs->get('livechat_license');
+      $group_id = $configs->get('livechat_group');
+      $settings = livechat_attach_js_settings($license, $group_id);
+
+      if (!empty($settings)) {
+        $attachments['#attached']['drupalSettings']['LiveChat'] = $settings;
+        $attachments['#attached']['library'][] = 'livechat/livechat';
+      }
+    }
+  }
+}
+
+/**
+ * Return settings for attaching LiveChat tracking code.
+ *
+ * @param string $license
+ *   LiveChat account license number.
+ * @param string $group_id
+ *   Id of the website for multi-site.
+ *
+ * @return array
+ */
+function livechat_attach_js_settings($license, $group_id) {
+  $settings = [];
+
+  if (!empty($license)) {
+    // Allow modules to add custom parameters and visitor information.
+    $params = [];
+    $visitor = [];
+    \Drupal::moduleHandler()->alter('livechat', $params, $visitor);
+
+    $settings = [
+      'license' => $license,
+      'params' => $params,
+      'visitor' => $visitor,
+    ];
+
+    // Add in the group id if it has been set.
+    if (!empty($group_id)) {
+      $settings['LiveChat']['group'] = $group_id;
+    }
+  }
+
+  return $settings;
+}
+
+/**
+ * Checks whether LiveChat is correctly set up.
+ *
+ * @return mixed
+ *   License number or FALSE.
+ */
+function livechat_is_installed() {
+  $configs = livechat_configs();
+  $license = $configs->get('livechat_license');
+  if (empty($license)) {
+    return FALSE;
+  }
+
+  return livechat_validate_license($license);
+}
+
+/**
+ * Validates a LiveChat license.
+ */
+function livechat_validate_license($license) {
+  if (empty($license)) {
+    return FALSE;
+  }
+
+  return preg_match('/^[0-9]{1,20}$/', $license);
+}
+
+/**
+ * LiveChat configurations.
+ *
+ * @return \Drupal\Core\Config\ImmutableConfig
+ *   An immutable configuration object.
+ */
+function livechat_configs() {
+  $configs = \Drupal::config(LIVECHAT_CONFIGURATION_NAME);
+
+  return $configs;
+}
+
+/**
+ * Checks whether LiveChat should be visible on a path, according to settings.
+ *
+ * @param string $path
+ *   The raw URI.
+ *
+ * @return bool
+ *   Display or not LiveChat popup.
+ */
+function livechat_check_visibility($path = NULL) {
+  $configs = livechat_configs();
+
+  // Default to the current path.
+  if (!isset($path)) {
+    // Important: in Drupal 8 any path returns with trailing slash.
+    // 'currentPath' !== '/currentPath in matchPath result.
+    // Thanks for this pattern with ^.
+    $path = \Drupal::service('path.current')->getPath();
+  }
+
+  // Visibility settings.
+  $visibility = $configs->get('livechat_visibility');
+  $pages = Unicode::strtolower($configs->get('livechat_pages'));
+
+  // If $visibility is set to LIVECHAT_VISIBILITY_NOTLISTED and the setting for
+  // excluding system paths is enabled, add system paths to the list of pages.
+  $exclude_system_paths = $configs->get('livechat_exclude_system_paths');
+  if ($visibility == LIVECHAT_VISIBILITY_NOTLISTED && $exclude_system_paths) {
+    $pages .= "\n" . LIVECHAT_VISIBILITY_SYSTEM_PATHS;
+  }
+
+  // Get the path alias as lowercase.
+  $path_alias = \Drupal::service('path.alias_manager')->getAliasByPath($path);
+  $expanded_path = Unicode::strtolower($path_alias);
+
+  // Compare the lowercase internal and lowercase path alias (if any).
+  $page_match = \Drupal::service('path.matcher')->matchPath($expanded_path, $pages);
+  if ($expanded_path != $path) {
+    $page_match = $page_match || \Drupal::service('path.matcher')->matchPath($path, $pages);
+  }
+
+  // When $visibility has a value of 0 (LIVECHAT_VISIBILITY_NOTLISTED), the
+  // widget should be displayed on all pages except those listed. When set to 1
+  // (LIVECHAT_VISIBILITY_LISTED), it should only be displayed on listed pages.
+  return !($visibility xor $page_match);
+}
diff --git a/livechat.permissions.yml b/livechat.permissions.yml
new file mode 100644
index 0000000..ec9e662
--- /dev/null
+++ b/livechat.permissions.yml
@@ -0,0 +1,7 @@
+use livechat:
+  title: 'Use LiveChat'
+  description: 'Access the LiveChat widget'
+
+administer livechat:
+  title: 'Administer LiveChat'
+  description: 'Administer the LiveChat settings'
diff --git a/livechat.routing.yml b/livechat.routing.yml
new file mode 100644
index 0000000..fd17cb9
--- /dev/null
+++ b/livechat.routing.yml
@@ -0,0 +1,15 @@
+livechat.settings:
+  path: '/admin/config/services/livechat'
+  defaults:
+    _form: 'Drupal\livechat\Form\LiveChatSettingsForm'
+    _title: 'LiveChat'
+  requirements:
+    _permission: 'administer livechat'
+
+livechat.license:
+  path: '/admin/config/services/livechat/license'
+  defaults:
+    _form: 'Drupal\livechat\Form\LiveChatLicenseForm'
+    _title: 'License'
+  requirements:
+    _permission: 'administer livechat'
diff --git a/src/Form/LiveChatLicenseForm.php b/src/Form/LiveChatLicenseForm.php
new file mode 100644
index 0000000..a8e6487
--- /dev/null
+++ b/src/Form/LiveChatLicenseForm.php
@@ -0,0 +1,140 @@
+<?php
+
+namespace Drupal\livechat\Form;
+
+use Drupal\Core\Form\ConfigFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Logger\RfcLogLevel;
+use GuzzleHttp\Client;
+use GuzzleHttp\Exception\RequestException;
+use Drupal\Component\Serialization\Json;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Configure Coffee for this site.
+ */
+class LiveChatLicenseForm extends ConfigFormBase {
+
+  /**
+   * A guzzle http client instance.
+   *
+   * @var \GuzzleHttp\Client
+   */
+  protected $httpClient;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(ConfigFactoryInterface $config_factory, Client $http_client) {
+    parent::__construct($config_factory);
+
+    $this->httpClient = $http_client;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('config.factory'),
+      $container->get('http_client')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'livechat_license_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getEditableConfigNames() {
+    return [
+      LIVECHAT_CONFIGURATION_NAME,
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $config = $this->config(LIVECHAT_CONFIGURATION_NAME);
+
+    $form['account'] = [
+      '#type' => 'details',
+      '#open' => TRUE,
+      '#title' => $this->t('Account details'),
+    ];
+    $form['account']['login'] = [
+      '#type' => 'email',
+      '#title' => $this->t('LiveChat login'),
+      '#description' => $this->t('User account login: my@email.com'),
+      '#default_value' => $config->get('livechat_login'),
+      '#required' => TRUE,
+    ];
+    if (!empty($config->get('livechat_login')) && !empty($config->get('livechat_license'))) {
+      $form['account']['license_number'] = [
+        '#type' => 'textfield',
+        '#title' => $this->t('License number'),
+        '#default_value' => $config->get('livechat_license'),
+        '#required' => TRUE,
+        '#attributes' => [
+          'disabled' => 'disabled',
+        ],
+      ];
+    }
+
+    return parent::buildForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validateForm(array &$form, FormStateInterface $form_state) {
+    // Validate the license number.
+    $login = $form_state->getValue('login');
+    if (!empty($login)) {
+      try {
+        $license_number_request = LIVECHAT_API_LICENSE_NUMBER . '/' . $login;
+        $response = $this->httpClient->get($license_number_request);
+        $data = $response->getBody()->getContents();
+        if (!empty($data)) {
+          $json = Json::decode($data);
+          if (!empty($json['number'])) {
+            if (livechat_validate_license($json['number'])) {
+              $form_state->setValue('license_number', $json['number']);
+            }
+            else {
+              $form_state->setErrorByName('login', $this->t('LiveChat license number is incorrect.'));
+            }
+          }
+          elseif (!empty($json['error'])) {
+            $form_state->setErrorByName('login', $json['error']);
+          }
+        }
+      }
+      catch (RequestException $e) {
+        watchdog_exception('LiveChat', $e, $e->getMessage(), [], RfcLogLevel::ERROR, $license_number_request);
+        $form_state->setErrorByName('login', $e->getMessage());
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $values = $form_state->getValues();
+    $this->config(LIVECHAT_CONFIGURATION_NAME)
+      ->set('livechat_login', $values['login'])
+      ->set('livechat_license', $values['license_number'])
+      ->save();
+
+    parent::submitForm($form, $form_state);
+  }
+
+}
diff --git a/src/Form/LiveChatSettingsForm.php b/src/Form/LiveChatSettingsForm.php
new file mode 100644
index 0000000..1184aca
--- /dev/null
+++ b/src/Form/LiveChatSettingsForm.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace Drupal\livechat\Form;
+
+use Drupal\Core\Form\ConfigFormBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Configure Coffee for this site.
+ */
+class LiveChatSettingsForm extends ConfigFormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'livechat_settings_form';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getEditableConfigNames() {
+    return [
+      LIVECHAT_CONFIGURATION_NAME,
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $config = $this->config(LIVECHAT_CONFIGURATION_NAME);
+
+    $form['path'] = [
+      '#type' => 'details',
+      '#title' => $this->t('Visibility'),
+      '#open' => TRUE,
+    ];
+
+    $form['path']['livechat_visibility'] = [
+      '#type' => 'radios',
+      '#title' => $this->t('Show LiveChat on'),
+      '#options' => array(
+        LIVECHAT_VISIBILITY_NOTLISTED => $this->t('All pages except those listed'),
+        LIVECHAT_VISIBILITY_LISTED => $this->t('Only the listed pages'),
+      ),
+      '#default_value' => $config->get('livechat_visibility'),
+    ];
+
+    $form['path']['livechat_pages'] = [
+      '#type' => 'textarea',
+      '#default_value' => $config->get('livechat_pages'),
+      '#description' => $this->t("Specify pages by using their paths. Enter one path per
+      line. The '*' character is a wildcard. Example paths are %blog for the blog
+      page and %blog-wildcard for every personal blog. %front is the
+      front page.", [
+        '%blog' => 'blog',
+        '%blog-wildcard' => 'blog/*',
+        '%front' => '<front>',
+      ]),
+    ];
+
+    $form['path']['livechat_exclude_system_paths'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Disable LiveChat on common system paths (recommended)'),
+      '#description' => $this->t('LiveChat will not trigger on the following paths: %paths', [
+        '%paths' => str_replace("\n", ', ', LIVECHAT_VISIBILITY_SYSTEM_PATHS),
+      ]),
+      '#default_value' => $config->get('livechat_exclude_system_paths'),
+    ];
+
+    $form['livechat_group'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Group Id'),
+      '#description' => $this->t('If you are using LiveChat on more than one website,
+       enter the id of the website here'),
+      '#default_value' => $config->get('livechat_group'),
+    ];
+
+    $form['livechat_enabled'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Enable LiveChat'),
+      '#description' => $this->t('Uncheck this box to disable LiveChat.'),
+      '#default_value' => $config->get('livechat_enabled'),
+    ];
+
+
+    return parent::buildForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $values = $form_state->getValues();
+    $this->config(LIVECHAT_CONFIGURATION_NAME)
+      ->set('livechat_visibility', $values['livechat_visibility'])
+      ->set('livechat_pages', $values['livechat_pages'])
+      ->set('livechat_exclude_system_paths', $values['livechat_exclude_system_paths'])
+      ->set('livechat_group', $values['livechat_group'])
+      ->set('livechat_enabled', $values['livechat_enabled'])
+      ->save();
+
+    parent::submitForm($form, $form_state);
+  }
+
+}