add submitter completed redirect url

app/controllers/api/submissions_controller.rb

@@ -142,9 +142,9 @@ module Api
 
       params.permit(
         key => [
-          [:send_email, :send_sms, :bcc_completed, {
+          [:send_email, :send_sms, :bcc_completed, :completed_redirect_url, {
             message: %i[subject body],
-            submitters: [[:send_email, :send_sms, :uuid, :name, :email, :role,
+            submitters: [[:send_email, :send_sms, :completed_redirect_url, :uuid, :name, :email, :role,
                           :completed, :phone, :application_key,
                           { values: {}, readonly_fields: [], message: %i[subject body],
                             fields: [%i[name default_value title description

app/controllers/submit_form_controller.rb

@@ -3,7 +3,7 @@
 class SubmitFormController < ApplicationController
   layout 'form'
 
-  around_action :with_browser_locale, only: %i[show completed]
+  around_action :with_browser_locale, only: %i[show completed success]
   skip_before_action :authenticate_user!
   skip_authorization_check
 
@@ -59,4 +59,6 @@ class SubmitFormController < ApplicationController
   def completed
     @submitter = Submitter.find_by!(slug: params[:submit_form_slug])
   end
+
+  def success; end
 end