Consider a production Laravel application that needs to use External side effects. How should the developer approach the requirement, and what should be checked before releasing it?

Consider a production Laravel application that needs to use External side effects. How should the developer approach the requirement, and what should be checked before releasing it? Assume the system receives real users, real data and concurrent requests. The correct approach is to identify where external side effects belongs, define its inputs and outputs, protect the boundary with validation and authorization where applicable, consider database and performance implications, and add automated tests for the expected behavior. Concept-specific reasoning: Sending email or making external API calls inside a database transaction can create coordination problems because the external system cannot automatically roll back. A useful implementation pattern is: DB::transaction(function () use ($request) { $order = Order::create($request->validated()); foreach ($request->items as $item) { $order->items()->create($item); } });