add submitter metadata

lib/submitters/create_stamp_attachment.rb

@@ -30,7 +30,6 @@ module Submitters
       )
     end
 
-    # rubocop:disable Metrics
     def generate_stamp_image(submitter)
       logo = Vips::Image.new_from_buffer(load_logo(submitter).read, '')
 
@@ -82,7 +81,6 @@ module Submitters
 
       Vips::Image.text(text, width: WIDTH, height: HEIGHT)
     end
-    # rubocop:enable Metrics
 
     def load_logo(_submitter)
       PdfIcons.logo_io

lib/submitters/serialize_for_api.rb

@@ -19,7 +19,7 @@ module Submitters
       serialize_params = {
         include: {},
         only: %i[id slug uuid name email phone completed_at external_id
-                 opened_at sent_at created_at updated_at],
+                 metadata opened_at sent_at created_at updated_at],
         methods: %i[status application_key]
       }