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

Consider a production Laravel application that needs to use Interfaces. 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 interfaces 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: Interfaces let application code depend on a contract while the container chooses a concrete implementation. A useful implementation pattern is: interface PaymentGateway {} class CheckoutService { public function __construct( private PaymentGateway $gateway ) {} }