Success Response (should NOT include data):

{
    "success": true,
    "message": "Data berhasil diterima dan disimpan",
    "endpoint": "uji-coba",
    "received_at": "2025-01-XX..."
}

Error Response:

{
    "success": false,
    "error": "Error message",
    "code": 400,
    "timestamp": "2025-01-XX..."
}