Update billing.md (#7282)

laravel · Sep 2, 2021 · 536c637 · 536c637
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@@ -320,6 +320,8 @@ Typically, when your application's users update their name, email address, or ot
 
 To automate this, you may define an event listener on your billable model that reacts to the model's `updated` event. Then, within your event listener, you may invoke the `syncStripeCustomerDetails` method on the model:
 
+    use function Illuminate\Events\queueable;
+
     /**
      * The "booted" method of the model.
      *