diff --git a/modules/apivie/browser.py b/modules/apivie/browser.py
index e42bd8cfeb3ec52ade705b01c62f146da62aac3c..16eab204af9f9398f9354149c79cb1401b161961 100644
--- a/modules/apivie/browser.py
+++ b/modules/apivie/browser.py
@@ -95,3 +95,12 @@ def iter_history(self, account):
             raise BrowserUnavailable()
 
         return self.page.iter_history()
+
+    def get_subscription_list(self):
+        raise NotImplementedError()
+
+    def iter_documents(self, subscription):
+        raise NotImplementedError()
+
+    def download_document(self, document):
+        raise NotImplementedError()