diff --git a/Provider.php b/Provider.php
index 033e256..90d4b3b 100644
--- a/Provider.php
+++ b/Provider.php
@@ -29,9 +29,9 @@ class Provider extends AbstractProvider
      * {@inheritdoc}
      */
     protected $scopes = [
-        'openid',
-        'profile',
-        'email',
+        self::SCOPE_OPENID,
+        self::SCOPE_PROFILE,
+        self::SCOPE_EMAIL,
     ];
 
     /**
@@ -44,12 +44,20 @@ protected function getOktaUrl()
         return $this->getConfig('base_url');
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    protected function getAuthServerId()
+    {
+        return $this->getConfig('auth_server_id', 'default');
+    }
+
     /**
      * {@inheritdoc}
      */
     public static function additionalConfigKeys()
     {
-        return ['base_url'];
+        return ['base_url', 'auth_server_id'];
     }
 
     /**
@@ -57,7 +65,7 @@ public static function additionalConfigKeys()
      */
     protected function getAuthUrl($state)
     {
-        return $this->buildAuthUrlFromBase($this->getOktaUrl().'/oauth2/v1/authorize', $state);
+        return $this->buildAuthUrlFromBase($this->getOktaUrl().'/oauth2/'.$this->getAuthServerId().'/v1/authorize', $state);
     }
 
     /**
@@ -65,7 +73,7 @@ protected function getAuthUrl($state)
      */
     protected function getTokenUrl()
     {
-        return $this->getOktaUrl().'/oauth2/v1/token';
+        return $this->getOktaUrl().'/oauth2/'.$this->getAuthServerId().'/v1/token';
     }
 
     /**
@@ -73,7 +81,7 @@ protected function getTokenUrl()
      */
     protected function getUserByToken($token)
     {
-        $response = $this->getHttpClient()->get($this->getOktaUrl().'/oauth2/v1/userinfo', [
+        $response = $this->getHttpClient()->get($this->getOktaUrl().'/oauth2/'.$this->getAuthServerId().'/v1/userinfo', [
             'headers' => [
                 'Authorization' => 'Bearer '.$token,
             ],