diff --git a/prosestopup.php b/prosestopup.php
index 1bf6fc8..6d7315b 100644
--- a/prosestopup.php
+++ b/prosestopup.php
@@ -2,6 +2,8 @@
 session_start();
 include "koneksi.php";
 
+header('Content-Type: application/json');
+
 if (!isset($_SESSION['user_id'])) {
     echo json_encode(['success' => false, 'message' => 'Not logged in']);
     exit;
@@ -10,7 +12,7 @@ if (!isset($_SESSION['user_id'])) {
 if ($_SERVER['REQUEST_METHOD'] == 'POST') {
     $user_id = $_SESSION['user_id'];
     $amount = intval($_POST['amount']);
-    $bank_method = $_POST['bank_method'];
+    $bank_method = $_POST['bank_method'] ?? 'unknown';
     
     // Validasi
     if ($amount <= 0 || $amount > 1000000) {