Introduced ServiceResult and ServiceResultError interfaces, and respective classes with related methods. These changes were necessary to add and handle service results throughout the app. We now have a standard way to return and handle both successes and errors from our services. This leads to cleaner, clearer, and more maintainable code.

app/ServiceResults/ServiceResult.php

@@ -0,0 +1,15 @@
+<?php
+declare(strict_types=1);
+
+namespace App\ServiceResults;
+
+use App\Contracts\ServiceResult as ServiceResultContract;
+use App\Contracts\ServiceResultError as ServiceResultErrorContract;
+
+abstract class ServiceResult implements ServiceResultContract
+{
+    public function isSuccess(): bool
+    {
+        return $this instanceof ServiceResultErrorContract !== true;
+    }
+}