Add GoCardless webhook controller for processing events

app/Http/Controllers/Gateways/GoCardlessOAuthWebhookController.php

@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2024. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+// @todo: Double check if this should be in admin module
+
+namespace App\Http\Controllers\Gateways;
+
+use App\Http\Controllers\Controller;
+use Illuminate\Http\Request;
+
+class GoCardlessOAuthController extends Controller
+{  
+    public function __invoke(Request $request)
+    {
+        foreach ($request->events as $event) {
+            match ($event['details']['cause']) {
+                'app_disconnected' => info($event),
+                default => nlog('Not acting on this event type: ' . $event['details']['cause']),
+            };
+        }
+    }
+}