# Error: test_mode_only

> Only a test key can do this

Source: https://docs.vlayers.ai/errors/test_mode_only

- HTTP status: 403
- Retry: No: fix the request first

## What happened

Only a test key can do this.

## Why

The operation exists only in test mode (`POST /v1/test/inbound`), and the request used a live key.

## How to fix it

Use a test key (`vl_test_…`) from the dashboard.

## Example response

```json
{
  "error": "test_mode_only",
  "message": "Only a test key can do this.",
  "requestId": "req-8f2c1d4b",
  "retryable": false,
  "docs": "https://docs.vlayers.ai/errors/test_mode_only"
}
```