add logic for updating signature token

app/Http/Controllers/EInvoiceTokenController.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
+ */
+
+namespace App\Http\Controllers;
+
+use App\Http\Controllers\BaseController;
+use App\Http\Requests\EInvoice\UpdateTokenRequest;
+use Illuminate\Http\Response;
+
+class EInvoiceTokenController extends BaseController
+{
+    public function __invoke(UpdateTokenRequest $request): Response
+    {
+        /** @var \App\Models\Company $company */
+        $company = auth()->user()->company();
+
+        $company->e_invoicing_token = $request->get('token');
+        $company->save();
+
+        return response()->noContent();
+    }
+}