chore: Skip reprocessing invalid Stripe events (#5200)

enterprise/app/services/enterprise/billing/handle_stripe_event_service.rb

@@ -3,7 +3,21 @@ class Enterprise::Billing::HandleStripeEventService
     ensure_event_context(event)
     case @event.type
     when 'customer.subscription.updated'
+      process_subscription_updated
+    when 'customer.subscription.deleted'
+      process_subscription_deleted
+    else
+      Rails.logger.debug { "Unhandled event type: #{event.type}" }
+    end
+  end
+
+  private
+
+  def process_subscription_updated
     plan = find_plan(subscription['plan']['product'])
+    # skipping self hosted plan events
+    return if plan.blank? || account.blank?
+
     account.update(
       custom_attributes: {
         stripe_customer_id: subscription.customer,
@@ -13,14 +27,14 @@ class Enterprise::Billing::HandleStripeEventService
         subscribed_quantity: subscription['quantity']
       }
     )
-    when 'customer.subscription.deleted'
-      Enterprise::Billing::CreateStripeCustomerService.new(account: account).perform
-    else
-      Rails.logger.debug { "Unhandled event type: #{event.type}" }
-    end
   end
 
-  private
+  def process_subscription_deleted
+    # skipping self hosted plan events
+    return if account.blank?
+
+    Enterprise::Billing::CreateStripeCustomerService.new(account: account).perform
+  end
 
   def ensure_event_context(event)
     @event = event