diff --git a/src/Providers/Custom/LinkedIn/Provider/Exception/LinkedInAccessDeniedException .php b/src/Providers/Custom/LinkedIn/Provider/Exception/LinkedInAccessDeniedException .php
index d332ece..5e9d328 100644
--- a/src/Providers/Custom/LinkedIn/Provider/Exception/LinkedInAccessDeniedException .php	
+++ b/src/Providers/Custom/LinkedIn/Provider/Exception/LinkedInAccessDeniedException .php	
@@ -1,8 +1,16 @@
 <?php
 
+/*
+ * This file is part of fof/oauth.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace FoF\OAuth\Providers\Custom\LinkedIn\Provider\Exception;
 
 class LinkedInAccessDeniedException extends \League\OAuth2\Client\Provider\Exception\IdentityProviderException
 {
-
 }
diff --git a/src/Providers/Custom/LinkedIn/Provider/LinkedIn.php b/src/Providers/Custom/LinkedIn/Provider/LinkedIn.php
index e5dfd37..ef6d469 100644
--- a/src/Providers/Custom/LinkedIn/Provider/LinkedIn.php
+++ b/src/Providers/Custom/LinkedIn/Provider/LinkedIn.php
@@ -1,8 +1,16 @@
 <?php
 
+/*
+ * This file is part of fof/oauth.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace FoF\OAuth\Providers\Custom\LinkedIn\Provider;
 
-use Exception;
 use FoF\OAuth\Providers\Custom\LinkedIn\Provider\Exception\LinkedInAccessDeniedException;
 use FoF\OAuth\Providers\Custom\LinkedIn\Token\LinkedInAccessToken;
 use InvalidArgumentException;
@@ -17,32 +25,33 @@ class LinkedIn extends \League\OAuth2\Client\Provider\AbstractProvider
     use BearerAuthorizationTrait;
 
     /**
-     * Default scopes
+     * Default scopes.
      *
      * @var array
      */
     public $defaultScopes = ['openid', 'profile', 'email'];
 
     /**
-     * Requested fields in scope, seeded with default values
+     * Requested fields in scope, seeded with default values.
      *
      * @var array
+     *
      * @see https://developer.linkedin.com/docs/fields/basic-profile
      */
     protected $fields = [
-        'sub', 'name', 'given_name', 'family_name', 'picture', 'locale', 'email', 'email_verified'
+        'sub', 'name', 'given_name', 'family_name', 'picture', 'locale', 'email', 'email_verified',
     ];
 
     /**
      * Constructs an OAuth 2.0 service provider.
      *
-     * @param array $options An array of options to set on this provider.
-     *     Options include `clientId`, `clientSecret`, `redirectUri`, and `state`.
-     *     Individual providers may introduce more options, as needed.
+     * @param array $options       An array of options to set on this provider.
+     *                             Options include `clientId`, `clientSecret`, `redirectUri`, and `state`.
+     *                             Individual providers may introduce more options, as needed.
      * @param array $collaborators An array of collaborators that may be used to
-     *     override this provider's default behavior. Collaborators include
-     *     `grantFactory`, `requestFactory`, and `httpClient`.
-     *     Individual providers may introduce more collaborators, as needed.
+     *                             override this provider's default behavior. Collaborators include
+     *                             `grantFactory`, `requestFactory`, and `httpClient`.
+     *                             Individual providers may introduce more collaborators, as needed.
      */
     public function __construct(array $options = [], array $collaborators = [])
     {
@@ -53,15 +62,15 @@ public function __construct(array $options = [], array $collaborators = [])
         parent::__construct($options, $collaborators);
     }
 
-
     /**
      * Creates an access token from a response.
      *
      * The grant that was used to fetch the response can be used to provide
      * additional context.
      *
-     * @param array $response
+     * @param array         $response
      * @param AbstractGrant $grant
+     *
      * @return AccessTokenInterface
      */
     protected function createAccessToken(array $response, AbstractGrant $grant)
@@ -87,7 +96,7 @@ protected function getScopeSeparator()
     }
 
     /**
-     * Get authorization url to begin OAuth flow
+     * Get authorization url to begin OAuth flow.
      *
      * @return string
      */
@@ -97,7 +106,7 @@ public function getBaseAuthorizationUrl()
     }
 
     /**
-     * Get access token url to retrieve token
+     * Get access token url to retrieve token.
      *
      * @return string
      */
@@ -107,7 +116,7 @@ public function getBaseAccessTokenUrl(array $params)
     }
 
     /**
-     * Get provider url to fetch user details
+     * Get provider url to fetch user details.
      *
      * @param AccessToken $token
      *
@@ -135,9 +144,12 @@ protected function getDefaultScopes()
      * Check a provider response for errors.
      *
      * @param ResponseInterface $response
-     * @param array $data Parsed response data
-     * @return void
+     * @param array             $data     Parsed response data
+     *
      * @throws IdentityProviderException
+     *
+     * @return void
+     *
      * @see https://developer.linkedin.com/docs/guide/v2/error-handling
      */
     protected function checkResponse(ResponseInterface $response, $data)
@@ -157,9 +169,12 @@ protected function checkResponse(ResponseInterface $response, $data)
      * Check a provider response for unauthorized errors.
      *
      * @param ResponseInterface $response
-     * @param array $data Parsed response data
-     * @return void
+     * @param array             $data     Parsed response data
+     *
      * @throws LinkedInAccessDeniedException
+     *
+     * @return void
+     *
      * @see https://developer.linkedin.com/docs/guide/v2/error-handling
      */
     protected function checkResponseUnauthorized(ResponseInterface $response, $data)
@@ -176,8 +191,9 @@ protected function checkResponseUnauthorized(ResponseInterface $response, $data)
     /**
      * Generate a user object from a successful user details request.
      *
-     * @param array $response
+     * @param array       $response
      * @param AccessToken $token
+     *
      * @return LinkedInResourceOwner
      */
     protected function createResourceOwner(array $response, AccessToken $token)
diff --git a/src/Providers/Custom/LinkedIn/Provider/LinkedInResourceOwner.php b/src/Providers/Custom/LinkedIn/Provider/LinkedInResourceOwner.php
index 2cfe433..c4f011b 100644
--- a/src/Providers/Custom/LinkedIn/Provider/LinkedInResourceOwner.php
+++ b/src/Providers/Custom/LinkedIn/Provider/LinkedInResourceOwner.php
@@ -1,27 +1,35 @@
-<?php 
+<?php
+
+/*
+ * This file is part of fof/oauth.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
 
 namespace FoF\OAuth\Providers\Custom\LinkedIn\Provider;
 
 use League\OAuth2\Client\Tool\ArrayAccessorTrait;
 
 /**
- * @property array $response
+ * @property array  $response
  * @property string $uid
  */
 class LinkedInResourceOwner extends \League\OAuth2\Client\Provider\GenericResourceOwner
 {
-
     use ArrayAccessorTrait;
 
     /**
-     * Raw response
+     * Raw response.
      *
      * @var array
      */
     protected $response = [];
 
     /**
-     * Sorted profile pictures
+     * Sorted profile pictures.
      *
      * @var array
      */
@@ -35,9 +43,9 @@ class LinkedInResourceOwner extends \League\OAuth2\Client\Provider\GenericResour
     /**
      * Creates new resource owner.
      *
-     * @param array  $response
+     * @param array $response
      */
-    public function __construct(array $response = array())
+    public function __construct(array $response = [])
     {
         $this->response = $response;
         $this->setSortedProfilePictures();
@@ -54,7 +62,7 @@ public function getAttribute($key)
     }
 
     /**
-     * Get user first name
+     * Get user first name.
      *
      * @return string|null
      */
@@ -64,7 +72,7 @@ public function getFirstName()
     }
 
     /**
-     * Get user user id
+     * Get user user id.
      *
      * @return string|null
      */
@@ -74,9 +82,10 @@ public function getId()
     }
 
     /**
-     * Get specific image by size
+     * Get specific image by size.
+     *
+     * @param int $size
      *
-     * @param integer $size
      * @return array|null
      */
     public function getImageBySize($size)
@@ -89,7 +98,7 @@ public function getImageBySize($size)
     }
 
     /**
-     * Get available user image sizes
+     * Get available user image sizes.
      *
      * @return array
      */
@@ -101,7 +110,7 @@ public function getImageSizes()
     }
 
     /**
-     * Get user image url
+     * Get user image url.
      *
      * @return string|null
      */
@@ -114,7 +123,7 @@ public function getImageUrl()
     }
 
     /**
-     * Get user last name
+     * Get user last name.
      *
      * @return string|null
      */
@@ -134,7 +143,7 @@ public function getSortedProfilePictures()
     }
 
     /**
-     * Get user url
+     * Get user url.
      *
      * @return string|null
      */
@@ -146,7 +155,7 @@ public function getUrl()
     }
 
     /**
-     * Get user email, if available
+     * Get user email, if available.
      *
      * @return string|null
      */
@@ -170,13 +179,13 @@ private function setSortedProfilePictures()
                 return
                     isset($element['data']['com.linkedin.digitalmedia.mediaartifact.StillImage'])
                     && strtoupper($element['authorizationMethod']) === 'PUBLIC'
-                    && isset($element['identifiers'][0]['identifier'])
-                ;
+                    && isset($element['identifiers'][0]['identifier']);
             });
             // order images by width, LinkedIn profile pictures are always squares, so that should be good enough
             usort($pictures, function ($elementA, $elementB) {
                 $wA = $elementA['data']['com.linkedin.digitalmedia.mediaartifact.StillImage']['storageSize']['width'];
                 $wB = $elementB['data']['com.linkedin.digitalmedia.mediaartifact.StillImage']['storageSize']['width'];
+
                 return $wA - $wB;
             });
             $pictures = array_map(function ($element) {
@@ -184,9 +193,10 @@ private function setSortedProfilePictures()
                 $url = $element['identifiers'][0]['identifier'];
                 $type = $element['identifiers'][0]['mediaType'];
                 $width = $element['data']['com.linkedin.digitalmedia.mediaartifact.StillImage']['storageSize']['width'];
+
                 return [
-                    'width' => $width,
-                    'url' => $url,
+                    'width'       => $width,
+                    'url'         => $url,
                     'contentType' => $type,
                 ];
             }, $pictures);
diff --git a/src/Providers/Custom/LinkedIn/Token/LinkedInAccessToken.php b/src/Providers/Custom/LinkedIn/Token/LinkedInAccessToken.php
index 54b2e87..60efb26 100644
--- a/src/Providers/Custom/LinkedIn/Token/LinkedInAccessToken.php
+++ b/src/Providers/Custom/LinkedIn/Token/LinkedInAccessToken.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of fof/oauth.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace FoF\OAuth\Providers\Custom\LinkedIn\Token;
 
 class LinkedInAccessToken extends \League\OAuth2\Client\Token\AccessToken
@@ -13,7 +22,8 @@ class LinkedInAccessToken extends \League\OAuth2\Client\Token\AccessToken
      * Constructs an access token.
      *
      * @param array $options An array of options returned by the service provider
-     *     in the access token request. The `access_token` option is required.
+     *                       in the access token request. The `access_token` option is required.
+     *
      * @throws InvalidArgumentException if `access_token` is not provided in `$options`.
      */
     public function __construct(array $options = [])
@@ -32,7 +42,7 @@ public function __construct(array $options = [])
     /**
      * Returns the refresh token expiration timestamp, if defined.
      *
-     * @return integer|null
+     * @return int|null
      */
     public function getRefreshTokenExpires()
     {
diff --git a/src/Providers/LinkedIn.php b/src/Providers/LinkedIn.php
index 536805b..a100110 100644
--- a/src/Providers/LinkedIn.php
+++ b/src/Providers/LinkedIn.php
@@ -14,8 +14,8 @@
 use Flarum\Forum\Auth\Registration;
 use Flarum\Settings\SettingsRepositoryInterface;
 use FoF\OAuth\Provider;
-use League\OAuth2\Client\Provider\AbstractProvider;
 use FoF\OAuth\Providers\Custom\LinkedIn\Provider\LinkedIn as LinkedInProvider;
+use League\OAuth2\Client\Provider\AbstractProvider;
 
 class LinkedIn extends Provider
 {