Target Android push by Firebase installation ID

lib/who_need_help/push/fcm_adapter.ex

@@ -40,7 +40,7 @@ defmodule WhoNeedHelp.Push.FCMAdapter do
   def payload(%Notification{} = notification, %PushDevice{} = device) do
     %{
       "message" => %{
-        "token" => device.token,
+        "fid" => device.token,
         "data" =>
           notification.data
           |> stringify_values()

test/who_need_help/push_product_test.exs

@@ -236,7 +236,8 @@ defmodule WhoNeedHelp.PushProductTest do
 
     message = payload["message"]
     refute Map.has_key?(message, "notification")
-    assert message["token"] == "firebase-installation-id"
+    refute Map.has_key?(message, "token")
+    assert message["fid"] == "firebase-installation-id"
     assert message["data"]["title"] == "New message"
     assert message["data"]["body"] == "Open Who Need Help to read the conversation."
     assert message["data"]["path"] == notification.path