How to properly implement dependency injection in Laravel 9 for services using interfaces?
I'm maintaining legacy code that Quick question that's been bugging me - I'm trying to implement dependency injection for a service in my Laravel 9 application, but I'm running into issues with type hints and contract violations. I have an interface `PaymentProcessorInterface` that my `StripePaymentProcessor` class implements. I want to inject this interface into my controller, but I keep getting the behavior: `Argument 1 passed to App\Http\Controllers\PaymentController::__construct() must implement interface App\Services\PaymentProcessorInterface, instance of App\Services\StripePaymentProcessor given`. Here's what my `PaymentController` looks like: ```php namespace App\Http\Controllers; use App\Services\PaymentProcessorInterface; class PaymentController { protected $paymentProcessor; public function __construct(PaymentProcessorInterface $paymentProcessor) { $this->paymentProcessor = $paymentProcessor; } public function processPayment() { // Logic to process payment } } ``` And here’s how I'm binding the interface to its implementation in the `AppServiceProvider`: ```php namespace App\Providers; use App\Services\PaymentProcessorInterface; use App\Services\StripePaymentProcessor; use Illuminate\Support\ServiceProvider; class AppServiceProvider extends ServiceProvider { public function register() { $this->app->bind(PaymentProcessorInterface::class, StripePaymentProcessor::class); } } ``` I've double-checked the namespaces and everything seems to be correct. I also ran `php artisan config:clear` and `php artisan cache:clear`, but the behavior continues. Is there something I'm missing in the binding process or in how I'm injecting the service? Any help would be greatly appreciated! This is part of a larger application I'm building. How would you solve this?