add billing policy

app/policies/account_policy.rb

@@ -30,32 +30,4 @@ class AccountPolicy < ApplicationPolicy
   def toggle_deletion?
     @account_user.administrator?
   end
-
-  def v2_pricing_plans?
-    @account_user.administrator?
-  end
-
-  def v2_topup_options?
-    @account_user.administrator?
-  end
-
-  def v2_topup?
-    @account_user.administrator?
-  end
-
-  def v2_subscribe?
-    @account_user.administrator?
-  end
-
-  def cancel_subscription?
-    @account_user.administrator?
-  end
-
-  def credit_grants?
-    @account_user.administrator?
-  end
-
-  def change_pricing_plan?
-    @account_user.administrator?
-  end
 end

app/policies/billing_policy.rb

@@ -0,0 +1,29 @@
+class BillingPolicy < ApplicationPolicy
+  def credit_grants?
+    @account_user.administrator?
+  end
+
+  def pricing_plans?
+    @account_user.administrator?
+  end
+
+  def topup_options?
+    @account_user.administrator?
+  end
+
+  def topup?
+    @account_user.administrator?
+  end
+
+  def subscribe?
+    @account_user.administrator?
+  end
+
+  def cancel_subscription?
+    @account_user.administrator?
+  end
+
+  def change_pricing_plan?
+    @account_user.administrator?
+  end
+end

enterprise/app/controllers/enterprise/api/v2/billing_controller.rb

@@ -1,6 +1,6 @@
 class Enterprise::Api::V2::BillingController < Api::BaseController
   before_action :fetch_account
-  before_action :check_authorization
+  before_action -> { check_authorization(:billing) }
   before_action :validate_topup_amount, only: [:topup]
 
   rescue_from StandardError, with: :render_error