Small hack to make notifications return empty for now.

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -7,6 +7,7 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
   alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.TwitterAPI.TwitterAPI
   alias Pleroma.Web.CommonAPI
+  import Logger
 
   def create_app(conn, params) do
     with cs <- App.register_changeset(%App{}, params) |> IO.inspect,
@@ -101,4 +102,9 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
       render conn, StatusView, "status.json", %{activity: activity, for: user, as: :activity}
     end
   end
+
+  def empty_array(conn, _) do
+    Logger.debug("Unimplemented, returning an empty array")
+    json(conn, [])
+  end
 end

lib/pleroma/web/router.ex

@@ -61,6 +61,8 @@ defmodule Pleroma.Web.Router do
     post "/statuses/:id/reblog", MastodonAPIController, :reblog_status
     post "/statuses/:id/favourite", MastodonAPIController, :fav_status
     post "/statuses/:id/unfavourite", MastodonAPIController, :unfav_status
+
+    get "/notifications", MastodonAPIController, :empty_array
   end
 
   scope "/api", Pleroma.Web do