diff --git a/src/Web/Users/Types.hs b/src/Web/Users/Types.hs
--- a/src/Web/Users/Types.hs
+++ b/src/Web/Users/Types.hs
@@ -58,6 +58,8 @@
     destroyUserBackend :: b -> IO ()
     -- | This cleans up invalid sessions and other tokens. Call periodically as needed.
     housekeepBackend :: b -> IO ()
+    -- | Retrieve a user id from the database
+    getUserIdByName :: b -> T.Text -> IO (Maybe (UserId b))
     -- | Retrieve a user from the database
     getUserById :: (FromJSON a, ToJSON a) => b -> UserId b -> IO (Maybe (User a))
     -- | List all users (unlimited, or limited)
@@ -82,6 +84,8 @@
     deleteUser :: b -> UserId b -> IO ()
     -- | Authentificate a user using username/email and password. The 'NominalDiffTime' describes the session duration
     authUser :: b -> T.Text -> PasswordPlain -> NominalDiffTime -> IO (Maybe SessionId)
+    -- | Authentificate a user and execute a single action.
+    withAuthUser :: FromJSON a => b -> T.Text -> (User a -> Bool) -> (UserId b -> IO r) -> IO (Maybe r)
     -- | Verify a 'SessionId'. The session duration can be extended by 'NominalDiffTime'
     verifySession :: b -> SessionId -> NominalDiffTime -> IO (Maybe (UserId b))
     -- | Destroy a session
diff --git a/users.cabal b/users.cabal
--- a/users.cabal
+++ b/users.cabal
@@ -1,5 +1,5 @@
 name:                users
-version:             0.2.0.1
+version:             0.3.0.0
 synopsis:            A library simplifying user management for web applications
 description:         Scrap the boilerplate for managing user accounts in web applications
                      .