Add authorized_fetch server setting in addition to env var (#25798)

app/services/concerns/payloadable.rb

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 module Payloadable
+  include AuthorizedFetchHelper
+
   # @param [ActiveModelSerializers::Model] record
   # @param [ActiveModelSerializers::Serializer] serializer
   # @param [Hash] options
@@ -23,6 +25,6 @@ module Payloadable
   end
 
   def signing_enabled?
-    ENV['AUTHORIZED_FETCH'] != 'true' && !Rails.configuration.x.limited_federation_mode
+    !authorized_fetch_mode?
   end
 end