Extending Authentication UserProviderInterace 4.1.26 update

extending.md

@@ -139,13 +139,19 @@ Let's take a look at the `UserProviderInterface`:
 	interface UserProviderInterface {
 
 		public function retrieveById($identifier);
+		public function retrieveByToken($identifier, $token);
+		public function updateRememberToken(UserInterface $user, $token);
 		public function retrieveByCredentials(array $credentials);
 		public function validateCredentials(UserInterface $user, array $credentials);
 
 	}
 
 The `retrieveById` function typically receives a numeric key representing the user, such as an auto-incrementing ID from a MySQL database. The `UserInterface` implementation matching the ID should be retrieved and returned by the method.
 
+The `retrieveByToken` function retrieves a user by their unique `$identifier` and "remember me" `$token`, stored in a field `remember_token`. As with with previous method, the `UserInterface` implementation should be returned.
+
+The `updateRememberToken` method updates the `$user` field `remember_token` with the new `$token`. The new token can be either a fresh token, assigned on successfull "remember me" login attempt, or a null when user is logged out.
+
 The `retrieveByCredentials` method receives the array of credentials passed to the `Auth::attempt` method when attempting to sign into an application. The method should then "query" the underlying persistent storage for the user matching those credentials. Typically, this method will run a query with a "where" condition on `$credentials['username']`. **This method should not attempt to do any password validation or authentication.**
 
 The `validateCredentials` method should compare the given `$user` with the `$credentials` to authenticate the user. For example, this method might compare the `$user->getAuthPassword()` string to a `Hash::make` of `$credentials['password']`.