expire download links

app/controllers/api/submitters_controller.rb

@@ -14,9 +14,11 @@ module Api
                            documents_attachments: :blob, attachments_attachments: :blob)
       )
 
+      expires_at = Accounts.link_expires_at(current_account)
+
       render json: {
         data: submitters.map do |s|
-                Submitters::SerializeForApi.call(s, with_template: true, with_events: true, params:)
+                Submitters::SerializeForApi.call(s, with_template: true, with_events: true, params:, expires_at:)
               end,
         pagination: {
           count: submitters.size,