add testing environment

app/controllers/testing_api_settings_controller.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class TestingApiSettingsController < ApplicationController
+  def index
+    authorize!(:manage, current_user.access_token)
+
+    @webhook_config =
+      current_account.encrypted_configs.find_or_initialize_by(key: EncryptedConfig::WEBHOOK_URL_KEY)
+
+    authorize!(:manage, @webhook_config)
+  end
+end