phpstan errors fixing

app/Http/Controllers/FetchLoanRemainingController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers;
 
 use App\Repos\System\Settings\Legal\PassportRepo;
+use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 use Illuminate\Validation\Rule;
 
@@ -13,7 +14,7 @@ class FetchLoanRemainingController extends Controller
      *
      * @param  Request  $request
      */
-    public function index(Request $request)
+    public function index(Request $request): JsonResponse
     {
         $request->validate([
             'passport_serie' => ['required', 'string', Rule::in(array_keys(PassportRepo::values()))],
@@ -57,10 +58,13 @@ class FetchLoanRemainingController extends Controller
 
         curl_close($curl);
 
-        return $response;
+        return response()->json($response);
     }
 
-    public function sampleResponse()
+    /**
+     * Sample request
+     */
+    public function sampleResponse(): JsonResponse
     {
         return response()->json([
             'idSeria' => 'I-AS',