Chore: Remove dead code related to billing (#935)

- remove subscription model
- remove billing-related code

config/initializers/00_init.rb

@@ -1,2 +0,0 @@
-PLAN_CONFIG = YAML.load_file(File.join(Rails.root, 'config', 'plans.yml'))
-$chargebee = ChargeBee.configure(site: ENV['CHARGEBEE_SITE'], api_key: ENV['CHARGEBEE_API_KEY'])

config/plans.yml

@@ -1,17 +0,0 @@
-active:
-  v1:
-    paid:
-      name: 'Platinum'
-      id: 'v1-platinum'
-      price: 29
-    trial:
-      name: 'Trial'
-      id: 'v1Trial'
-      price: 0
-inactive:
-  v0:
-    free:
-      name: 'Free'
-      price: 0
-trial_period: 365
-default_pricing_version: 'v1'

config/routes.rb

@@ -83,13 +83,6 @@ Rails.application.routes.draw do
           resources :notifications, only: [:index, :update]
           resource :notification_settings, only: [:show, :update]
 
-          # this block is only required if subscription via chargebee is enabled
-          resources :subscriptions, only: [:index] do
-            collection do
-              get :summary
-            end
-          end
-
           resources :webhooks, except: [:show]
         end
       end
@@ -114,12 +107,6 @@ Rails.application.routes.draw do
         resources :inbox_members, only: [:index]
         resources :labels, only: [:create, :destroy]
       end
-
-      resources :webhooks, only: [] do
-        collection do
-          post :chargebee
-        end
-      end
     end
 
     namespace :v2 do