wip: booking process

src/BusProNet/Model/Error.php

@@ -1,9 +1,21 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\BusProNet\Model;
 
+/**
+ * Represents error codes and messages for the BusProNet API.
+ *
+ * This class provides a static mapping of error codes to their corresponding
+ * German error messages for consistent error handling across the application.
+ * Error codes range from 100-999 and cover various API scenarios.
+ */
 class Error
 {
+    /**
+     * @var array<int, string>
+     */
     private static array $errors = [
         100 => 'Anfrageknoten fehlt',
         101 => 'Satzknoten fehlt in Anfrageknoten',