Heartbeat API with device token authentication

config/routes.rb

@@ -1,5 +1,8 @@
 Rails.application.routes.draw do
   devise_for :admin_users, ActiveAdmin::Devise.config
+
+  post 'heartbeats', to: 'heartbeats#create', :defaults => { :format => :json }
+  
   ActiveAdmin.routes(self)
   # The priority is based upon order of creation: first created -> highest priority.
   # See how all your routes lay out with "rake routes".