diff --git a/app/controllers/concerns/group.rb b/app/controllers/concerns/group.rb
new file mode 100644
index 0000000..11bffbd
--- /dev/null
+++ b/app/controllers/concerns/group.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module DiscoursePatrons
+  module Group
+    extend ActiveSupport::Concern
+
+    def plan_group(plan)
+      ::Group.find_by_name(plan[:metadata][:group_name])
+    end
+  end
+end
diff --git a/app/controllers/subscriptions_controller.rb b/app/controllers/subscriptions_controller.rb
index 35857e1..3dc51d3 100644
--- a/app/controllers/subscriptions_controller.rb
+++ b/app/controllers/subscriptions_controller.rb
@@ -3,6 +3,7 @@
 module DiscoursePatrons
   class SubscriptionsController < ::ApplicationController
     include DiscoursePatrons::Stripe
+    include DiscoursePatrons::Group
     before_action :set_api_key
     requires_login
 
@@ -59,10 +60,6 @@ module DiscoursePatrons
       { user_id: current_user.id, username: current_user.username_lower }
     end
 
-    def plan_group(plan)
-      Group.find_by_name(plan[:metadata][:group_name])
-    end
-
     def subscription_ok
       ['active', 'trialing'].include?(@subscription[:status])
     end
diff --git a/app/controllers/user/subscriptions_controller.rb b/app/controllers/user/subscriptions_controller.rb
index 14e1587..0802747 100644
--- a/app/controllers/user/subscriptions_controller.rb
+++ b/app/controllers/user/subscriptions_controller.rb
@@ -4,6 +4,7 @@ module DiscoursePatrons
   module User
     class SubscriptionsController < ::ApplicationController
       include DiscoursePatrons::Stripe
+      include DiscoursePatrons::Group
       before_action :set_api_key
       requires_login
 
diff --git a/plugin.rb b/plugin.rb
index 9465d0d..4b759c5 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -45,6 +45,7 @@ after_initialize do
   [
     "../lib/discourse_patrons/engine",
     "../config/routes",
+    "../app/controllers/concerns/group",
     "../app/controllers/concerns/stripe",
     "../app/controllers/admin_controller",
     "../app/controllers/admin/plans_controller",