diff --git a/spec/MessengerSpec.php b/spec/MessengerSpec.php
index f065732..8d005d5 100644
--- a/spec/MessengerSpec.php
+++ b/spec/MessengerSpec.php
@@ -16,6 +16,7 @@
 use Tgallice\FBMessenger\Model\MessageResponse;
 use Tgallice\FBMessenger\Model\ThreadSetting;
 use Tgallice\FBMessenger\Model\UserProfile;
+use Tgallice\FBMessenger\Model\WhitelistedDomains;
 use Tgallice\FBMessenger\NotificationType;
 use Tgallice\FBMessenger\TypingIndicator;
 
@@ -297,4 +298,52 @@ function it_should_set_typing_status($client)
 
         $this->setTypingStatus('USER_ID', TypingIndicator::TYPING_ON);
     }
+    
+    function it_should_define_domain_whitelisting($client)
+    {
+        $expectedBody = [
+            'setting_type' => 'domain_whitelisting',
+            'whitelisted_domains' => ['https://www.google.com'],
+            'domain_action_type' => 'add'
+        ];
+    
+        $client->post('/me/thread_settings', Argument::that(function ($body) use ($expectedBody) {
+            return json_encode($body) === json_encode($expectedBody);
+        }))->shouldBeCalled();
+    
+        $this->setDomainWhitelisting(['https://www.google.com']);
+    }
+    
+    function it_get_domain_whitelisting($client, ResponseInterface $response)
+    {
+        $response->getBody()->willReturn('
+            {
+                "data" : [{
+                    "whitelisted_domains" : [
+                        "domain_1",
+                        "domain_2"
+                    ],
+                    "id" : "123456"
+                }]
+            }
+        ');
+    
+        $query = [
+            'fields' => 'whitelisted_domains',
+        ];
+    
+        $client->get('/me/thread_settings', $query)->willReturn($response);
+    
+        $whitelistedDomains = new WhitelistedDomains([
+            'data' => [[
+                'whitelisted_domains' => [
+                    'domain_1',
+                    'domain_2'
+                ],
+                'id' => '123456'
+            ]]
+        ]);
+    
+        $this->getDomainWhitelisting()->shouldBeLike($whitelistedDomains);
+    }
 }
diff --git a/spec/Model/ThreadSetting/DomainWhitelistingSpec.php b/spec/Model/ThreadSetting/DomainWhitelistingSpec.php
new file mode 100644
index 0000000..0c50a2d
--- /dev/null
+++ b/spec/Model/ThreadSetting/DomainWhitelistingSpec.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace spec\Tgallice\FBMessenger\Model\ThreadSetting;
+
+use PhpSpec\ObjectBehavior;
+use Tgallice\FBMessenger\Model\ThreadSetting;
+
+class DomainWhitelistingSpec extends ObjectBehavior
+{
+    function let()
+    {
+        $this->beConstructedWith(['https://google.com']);
+    }
+    
+    function it_is_initializable()
+    {
+        $this->shouldHaveType('Tgallice\FBMessenger\Model\ThreadSetting\DomainWhitelisting');
+    }
+    
+    function it_has_a_domains()
+    {
+        $this->getDomains()->shouldReturn(['https://google.com']);
+    }
+    
+    function it_has_a_add_action()
+    {
+        $this->getAction()->shouldReturn('add');
+    }
+    
+    function it_has_a_remove_action()
+    {
+        $this->beConstructedWith(['https://google.com'], 'remove');
+        
+        $this->getAction()->shouldReturn('remove');
+    }
+    
+    function it_throws_exception_when_is_not_add_or_remove_action()
+    {
+        $this->beConstructedWith(['https://google.com'], 'update');
+    
+        $this
+            ->shouldThrow(new \InvalidArgumentException('The action must be type: "add" or "remove".'))
+            ->duringInstantiation();
+    }
+    
+    function it_throws_exception_when_domains_is_not_a_array()
+    {
+        $this->beConstructedWith('not array');
+    
+        $this
+            ->shouldThrow(new \InvalidArgumentException('Domains must be a array.'))
+            ->duringInstantiation();
+    }
+    
+    function it_throws_exception_when_one_domains_has_not_a_https_protocol()
+    {
+        $this->beConstructedWith([
+            'https://petersfancyapparel.com',
+            'http://google.com',
+            'https://www.google.com'
+        ], 'add');
+    
+        $this
+            ->shouldThrow(new \InvalidArgumentException('Each domain must be a "https" protocol.'))
+            ->duringInstantiation();
+    }
+    
+    function it_should_be_serializable()
+    {
+        $this->shouldImplement(\JsonSerializable::class);
+    
+        $expected = [
+            'whitelisted_domains' => ['https://google.com'],
+            'domain_action_type' => 'add'
+        ];
+    
+        $this->jsonSerialize()->shouldBeLike($expected);
+    }
+}
diff --git a/src/Messenger.php b/src/Messenger.php
index 96c1a12..4ec2525 100644
--- a/src/Messenger.php
+++ b/src/Messenger.php
@@ -11,7 +11,9 @@
 use Tgallice\FBMessenger\Model\ThreadSetting;
 use Tgallice\FBMessenger\Model\ThreadSetting\GreetingText;
 use Tgallice\FBMessenger\Model\ThreadSetting\StartedButton;
+use Tgallice\FBMessenger\Model\ThreadSetting\DomainWhitelisting;
 use Tgallice\FBMessenger\Model\UserProfile;
+use Tgallice\FBMessenger\Model\WhitelistedDomains;
 
 class Messenger
 {
@@ -170,6 +172,33 @@ public function deleteGreetingText()
         $this->deleteThreadSettings($setting);
     }
 
+    /**
+     * @param array $domains
+     * @param string $action
+     */
+    public function setDomainWhitelisting($domains, $action = DomainWhitelisting::TYPE_ADD)
+    {
+        $domainWhitelisting = new DomainWhitelisting($domains, $action);
+        $setting = $this->buildSetting(ThreadSetting::TYPE_DOMAIN_WHITELISTING, null, $domainWhitelisting, true);
+    
+        $this->postThreadSettings($setting);
+    }
+    
+    /**
+     * @return array
+     */
+    public function getDomainWhitelisting()
+    {
+        $query = [
+            'fields' => DomainWhitelisting::WHITELISTED_DOMAINS
+        ];
+    
+        $response = $this->client->get('/me/thread_settings', $query);
+        $data = $this->decodeResponse($response);
+    
+        return WhitelistedDomains::create($data);
+    }
+    
     /**
      * Messenger Factory
      *
@@ -205,10 +234,11 @@ private function deleteThreadSettings(array $setting)
      * @param string $type
      * @param null|string $threadState
      * @param mixed $value
+     * @param bool $mergeValueWithSetting
      *
      * @return array
      */
-    private function buildSetting($type, $threadState = null, $value = null)
+    private function buildSetting($type, $threadState = null, $value = null, $mergeValueWithSetting = false)
     {
         $setting = [
             'setting_type' => $type,
@@ -217,8 +247,10 @@ private function buildSetting($type, $threadState = null, $value = null)
         if (!empty($threadState)) {
             $setting['thread_state'] = $threadState;
         }
-
-        if (!empty($value)) {
+        
+        if($mergeValueWithSetting === true) {
+        	$setting = array_merge($setting, $value->jsonSerialize());
+        } else if(!empty($value)) {
             $setting[$type] = $value;
         }
 
diff --git a/src/Model/ThreadSetting.php b/src/Model/ThreadSetting.php
index 67d83b7..7b7afdd 100644
--- a/src/Model/ThreadSetting.php
+++ b/src/Model/ThreadSetting.php
@@ -7,6 +7,7 @@ interface ThreadSetting
     // Setting type
     const TYPE_GREETING = 'greeting';
     const TYPE_CALL_TO_ACTIONS = 'call_to_actions';
+    const TYPE_DOMAIN_WHITELISTING = 'domain_whitelisting';
 
     // Thread state
     const NEW_THREAD = 'new_thread';
diff --git a/src/Model/ThreadSetting/DomainWhitelisting.php b/src/Model/ThreadSetting/DomainWhitelisting.php
new file mode 100644
index 0000000..9b3f42e
--- /dev/null
+++ b/src/Model/ThreadSetting/DomainWhitelisting.php
@@ -0,0 +1,102 @@
+<?php
+
+namespace Tgallice\FBMessenger\Model\ThreadSetting;
+
+use Tgallice\FBMessenger\Model\ThreadSetting;
+
+class DomainWhitelisting implements ThreadSetting, \JsonSerializable
+{
+    const TYPE_ADD = 'add';
+    const TYPE_REMOVE = 'remove';
+    
+    const WHITELISTED_DOMAINS = 'whitelisted_domains';
+    const DOMAIN_ACTION_TYPE = 'domain_action_type';
+    
+    /**
+     * @var string
+     */
+    private $action;
+    
+    /**
+     * @var array
+     */
+    private $domains = [];
+    
+    /**
+     * 
+     * @param string $action
+     * @param array $domains
+     * 
+     * @throws \InvalidArgumentException
+     */
+    public function __construct($domains, $action = DomainWhitelisting::TYPE_ADD)
+    {
+        self::validateAction($action);
+        self::validateDomains($domains);
+        
+        $this->action = $action;
+        $this->domains = $domains;
+    }
+    
+    /**
+     * 
+     * @return array
+     */
+    public function getDomains()
+    {
+        return $this->domains;
+    }
+    
+    /**
+     * 
+     * @return string
+     */
+    public function getAction()
+    {
+        return $this->action;
+    }
+    
+    /**
+     * 
+     * @param string $action
+     * 
+     * @throws \InvalidArgumentException
+     */
+    public static function validateAction($action)
+    {
+        if(!in_array($action, [DomainWhitelisting::TYPE_ADD, DomainWhitelisting::TYPE_REMOVE])) {
+            throw new \InvalidArgumentException('The action must be type: "add" or "remove".');
+        }
+    }
+    
+    /**
+     * 
+     * @param array $domains
+     * 
+     * @throws \InvalidArgumentException
+     */
+    public static function validateDomains($domains)
+    {
+        if(!is_array($domains)) {
+            throw new \InvalidArgumentException('Domains must be a array.');
+        }
+        
+        //https://developers.facebook.com/docs/messenger-platform/thread-settings/domain-whitelisting
+        foreach($domains as $domain) {
+            if(!preg_match('#^https:\/\/#', $domain)) {
+                throw new \InvalidArgumentException('Each domain must be a "https" protocol.');
+            }
+        }
+    }
+    
+    /**
+     * @inheritdoc
+     */
+    public function jsonSerialize()
+    {
+        return [
+            DomainWhitelisting::WHITELISTED_DOMAINS => $this->domains,
+            DomainWhitelisting::DOMAIN_ACTION_TYPE => $this->action
+        ];
+    }
+}
diff --git a/src/Model/WhitelistedDomains.php b/src/Model/WhitelistedDomains.php
new file mode 100644
index 0000000..672d2ef
--- /dev/null
+++ b/src/Model/WhitelistedDomains.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Tgallice\FBMessenger\Model;
+
+use Tgallice\FBMessenger\Model\ThreadSetting\DomainWhitelisting;
+
+class WhitelistedDomains
+{
+    /**
+     * @var array
+     */
+    private $data;
+
+    /**
+     * @param array $data
+     */
+    public function __construct(array $data)
+    {
+        $this->data = $data;
+    }
+    
+    /**
+     * @return array|null
+     */
+    public function getDomains()
+    {
+        return isset($this->data['data'][0][DomainWhitelisting::WHITELISTED_DOMAINS]) ?
+        	$this->data['data'][0][DomainWhitelisting::WHITELISTED_DOMAINS] :
+        	null;
+    }
+    
+    /**
+     * @param array $data
+     *
+     * @return WhitelistedDomains
+     */
+    public static function create(array $data)
+    {
+        return new self($data);
+    }
+}
\ No newline at end of file