curl -X POST http://localhost:13579/api/license/validate \
  -H "Content-Type: application/json" \
  -H "X-Machine-ID: ABCDEF123456" \
  -d '{
    "payload": "eyJtYWNoaW5lX2lkIjoiQUJDREVGMTIzNDU2IiwiZXhwaXJ5IjoiIiwiZmVhdHVyZXMiOlsiZ3B1Iiwib2NyIl19",
    "signature": "MEQCICjzP23WiNwBmq6/fbgETy0WA5FJ6rP4KFwE+dDnarOqAiAnxrtik5VQlpgav0oSKu6bmXPbLuK9BDhLE6OmhQcMnA=="
  }'