diff --git a/alarm.py b/alarm.py
index 3180de1..e317a8b 100644
--- a/alarm.py
+++ b/alarm.py
@@ -45,6 +45,7 @@ if __name__ == '__main__':
         network = Network(NetworkUser(os.environ['SPOTCLIENT'],
                                       os.environ['SPOTSECRET'],
                                       os.environ['SPOTREFRESH']))
+        network.user.refresh_token()
 
         found = False
 
diff --git a/backup.py b/backup.py
index a6b807c..b1948ca 100644
--- a/backup.py
+++ b/backup.py
@@ -32,6 +32,7 @@ if __name__ == '__main__':
         network = Network(NetworkUser(os.environ['SPOTCLIENT'],
                                       os.environ['SPOTSECRET'],
                                       os.environ['SPOTREFRESH']))
+        network.user.refresh_token()
         playlists = network.get_user_playlists()
 
         for playlist in playlists:
diff --git a/generate_playlists.py b/generate_playlists.py
index e0d4beb..9299c16 100644
--- a/generate_playlists.py
+++ b/generate_playlists.py
@@ -125,9 +125,9 @@ def go():
             net = Network(NetworkUser(os.environ['SPOTCLIENT'],
                                       os.environ['SPOTSECRET'],
                                       os.environ['SPOTREFRESH']))
+            net.user.refresh_token()
 
             engine = PlaylistEngine(net)
-            engine.load_user_playlists()
 
             for super_playlist in to_execute:
                 update_super_playlist(engine, super_playlist)
diff --git a/getaccesstoken.py b/getaccesstoken.py
index b46159b..90b65ff 100644
--- a/getaccesstoken.py
+++ b/getaccesstoken.py
@@ -18,5 +18,6 @@ if __name__ == '__main__':
     network = Network(NetworkUser(os.environ['SPOTCLIENT'],
                                   os.environ['SPOTSECRET'],
                                   os.environ['SPOTREFRESH']))
+    network.user.refresh_token()
 
     print(network.user.access_token)
diff --git a/sort_playlist.py b/sort_playlist.py
index da84841..dd514e1 100644
--- a/sort_playlist.py
+++ b/sort_playlist.py
@@ -31,6 +31,7 @@ def go(playlist_name):
     net = Network(NetworkUser(os.environ['SPOTCLIENT'],
                               os.environ['SPOTSECRET'],
                               os.environ['SPOTREFRESH']))
+    net.user.refresh_token()
 
     engine = PlaylistEngine(net)
     engine.reorder_playlist_by_added_date(playlist_name)
diff --git a/spotframework/model/service.py b/spotframework/model/service.py
index 2173b5f..023f14b 100644
--- a/spotframework/model/service.py
+++ b/spotframework/model/service.py
@@ -15,6 +15,8 @@ class Context:
             self.uri = Uri(uri)
         else:
             self.uri = uri
+        if self.uri.object_type not in [Uri.ObjectType.album, Uri.ObjectType.artist, Uri.ObjectType.playlist]:
+            raise TypeError('context uri must be one of album, artist, playlist')
         self.object_type = object_type
         self.href = href
         self.external_spot = external_spot
diff --git a/spotframework/model/track.py b/spotframework/model/track.py
index b8ea4fd..e03e1b3 100644
--- a/spotframework/model/track.py
+++ b/spotframework/model/track.py
@@ -86,6 +86,10 @@ class SpotifyTrack(Track):
         return Color.BOLD + Color.YELLOW + 'SpotifyTrack' + Color.END + \
                f': {self.name}, ({self.album}), {self.artists}, {self.uri}'
 
+    @staticmethod
+    def get_uri_shell(uri):
+        return SpotifyTrack(name=None, album=None, artists=None, uri=uri)
+
 
 class LibraryTrack(SpotifyTrack):
     def __init__(self,
diff --git a/spotframework/net/user.py b/spotframework/net/user.py
index c934988..cf94419 100644
--- a/spotframework/net/user.py
+++ b/spotframework/net/user.py
@@ -5,6 +5,7 @@ from base64 import b64encode
 import logging
 import time
 from typing import Optional
+from datetime import datetime, timezone
 
 logger = logging.getLogger(__name__)
 
@@ -20,8 +21,10 @@ class NetworkUser(User):
         self.client_id = client_id
         self.client_secret = client_secret
 
-        self.refresh_token()
-        self.refresh_info()
+        self.last_refreshed = None
+        self.token_expiry = None
+
+        self.on_refresh = []
 
     def __repr__(self):
         return Color.RED + Color.BOLD + 'NetworkUser' + Color.END + \
@@ -42,12 +45,18 @@ class NetworkUser(User):
         headers = {'Authorization': 'Basic %s' % idsecret}
 
         data = {"grant_type": "refresh_token", "refresh_token": self.refreshtoken}
-    
+
+        now = datetime.now(timezone.utc)
         req = requests.post('https://accounts.spotify.com/api/token', data=data, headers=headers)
    
         if 200 <= req.status_code < 300:
             logger.debug('token refreshed')
-            self.accesstoken = req.json()['access_token']
+            resp = req.json()
+            self.accesstoken = resp['access_token']
+            self.token_expiry = resp['expires_in']
+            self.last_refreshed = now
+            for func in self.on_refresh:
+                func(self)
         else:
 
             if req.status_code == 429: