Add experimental registrant change accept/deny API endpoint

app/controllers/api/v1/registrant/confirms_controller.rb

@@ -17,10 +17,23 @@ module Api
         end
 
         def update
+          verification = RegistrantVerification.new(domain_id: @domain.id,
+            verification_token: confirmation_params[:token])
+
+            head(update_action(verification) ? :ok : :bad_request)
         end
 
         private
 
+        def update_action(verification)
+          initiator = "email link, #{t(:user_not_authenticated)}"
+          if params[:confirm].present?
+            verification.domain_registrant_change_confirm!(initiator)
+          else
+            verification.domain_registrant_change_reject!(initiator)
+          end
+        end
+
         def serialized_registrant(registrant)
           {
             name: registrant.try(:name),

app/services/registrant_change.rb

@@ -5,6 +5,7 @@ class RegistrantChange
   end
 
   def confirm
+    Dispute.close_by_domain(@domain.name) if @domain.disputed?
     notify_registrant
   end