require the job in plugin

app/jobs/award_group.rb

@@ -1,16 +1,7 @@
-# Discourse forces the namespace at top level :(
 
 module Jobs
-  class AwardGroup
-    def perform(args)
-      puts '====================== The Job was performed ==========================='
-    end
-
-    def self.perform_in(arg, opts)
-      puts '====================== The Job was enqueued ==========================='
-    end
-
-    def execute(args)
+  class AwardGroup < ::Jobs::Onceoff
+    def execute_onceoff(args)
       puts '====================== The Job was executed ==========================='
       user = User.find_by_email(args[:email])
       if user.present?

lib/discourse_donations/engine.rb

@@ -1,4 +1,3 @@
-require_relative '../../app/jobs/award_group'
 
 module ::DiscourseDonations
   class Engine < ::Rails::Engine

plugin.rb

@@ -11,6 +11,8 @@ load File.expand_path('../lib/discourse_donations/engine.rb', __FILE__)
 enabled_site_setting :discourse_donations_enabled
 
 after_initialize do
+  load File.expand_path('../app/jobs/award_group.rb', __FILE__)
+
   # Must be placed on every page for fraud protection.
   header_script = '<script src="https://js.stripe.com/v3/"></script>'
   discourse_donations_theme = Theme.find_or_create_by(name: 'Discourse Donations Header', hidden: false, user_id: -1)