phpstan errors fixing

app/Http/Controllers/Api/FetchLoanHistoryController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use Illuminate\Http\JsonResponse;
 use Illuminate\Http\Request;
 
 class FetchLoanHistoryController extends Controller
@@ -10,7 +11,7 @@ class FetchLoanHistoryController extends Controller
     /**
      * Fetch loan history
      */
-    public function index(Request $request)
+    public function index(Request $request): JsonResponse
     {
         $request->validate([
             'passport_serie' => ['required', 'string', 'max:255'],
@@ -50,10 +51,13 @@ class FetchLoanHistoryController extends Controller
 
         curl_close($curl);
 
-        return $response;
+        return response()->json($response);
     }
 
-    public function sampleRequest()
+    /**
+     * Sample request for dev mode
+     */
+    public function sampleRequest(): JsonResponse
     {
         return response()->json([
             'recipient' => [