diff --git a/src/FirebaseCloudMessaging/Message.php b/src/FirebaseCloudMessaging/Message.php
index e2f2113300..c8eb1f24db 100644
--- a/src/FirebaseCloudMessaging/Message.php
+++ b/src/FirebaseCloudMessaging/Message.php
@@ -42,6 +42,12 @@ class Message extends \Google\Model
   public $data;
   protected $fcmOptionsType = FcmOptions::class;
   protected $fcmOptionsDataType = '';
+  /**
+   * Optional. Firebase Installation ID to send a message to.
+   *
+   * @var string
+   */
+  public $fid;
   /**
    * Output Only. The identifier of the message sent, in the format of
    * `projects/messages/{message_id}`.
@@ -52,8 +58,11 @@ class Message extends \Google\Model
   protected $notificationType = Notification::class;
   protected $notificationDataType = '';
   /**
-   * Registration token to send a message to.
+   * Deprecated: Use `fid` instead. Registration token to send a message to.
+   * During the transition period, this field also accepts a Firebase
+   * Installation ID (FID).
    *
+   * @deprecated
    * @var string
    */
   public $token;
@@ -155,6 +164,22 @@ public function getFcmOptions()
   {
     return $this->fcmOptions;
   }
+  /**
+   * Optional. Firebase Installation ID to send a message to.
+   *
+   * @param string $fid
+   */
+  public function setFid($fid)
+  {
+    $this->fid = $fid;
+  }
+  /**
+   * @return string
+   */
+  public function getFid()
+  {
+    return $this->fid;
+  }
   /**
    * Output Only. The identifier of the message sent, in the format of
    * `projects/messages/{message_id}`.
@@ -189,8 +214,11 @@ public function getNotification()
     return $this->notification;
   }
   /**
-   * Registration token to send a message to.
+   * Deprecated: Use `fid` instead. Registration token to send a message to.
+   * During the transition period, this field also accepts a Firebase
+   * Installation ID (FID).
    *
+   * @deprecated
    * @param string $token
    */
   public function setToken($token)
@@ -198,6 +226,7 @@ public function setToken($token)
     $this->token = $token;
   }
   /**
+   * @deprecated
    * @return string
    */
   public function getToken()