> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bridgelinepf.com/llms.txt
> Use this file to discover all available pages before exploring further.

# TEST_MODE_ONLY

> A test helper was called with a live key. Test helpers need a test key.

`403 Forbidden` · type `permission`

**When it happens**

You called a test helper, an endpoint under `/v1/test_helpers/`, with a live key (`bl_live_`). Test helpers act out what a person would do, such as your client tapping **I'm interested**, so they only work on test data, with a test key.

**What to do**

Call it with a test key (`bl_test_`), on a quote that key created. See [test and live mode](/concepts/test-and-live-mode).

## Example

```json 403 Forbidden theme={null}
{
  "error": {
    "type": "permission",
    "code": "TEST_MODE_ONLY",
    "message": "This endpoint is only available with a test-mode (bl_test_) API key.",
    "doc_url": "https://docs.bridgelinepf.com/errors#TEST_MODE_ONLY",
    "request_id": "req_8fJ2kQ9xLm4TzW7nB3cY5pDv"
  }
}
```

See all [error codes](/errors), or how to [handle errors](/guides/errors).


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