# invalid_token

HTTP 400 · End-user sign-in (SPEC §7)

This link or code has expired or was already used. Ask for a new one.

## Does retrying help?

Not as it is. Change the request as the message says, then send it again.

## The response

Every Flatstack error has this shape. `details`, when present, says more about this case.

```json
{
  "error": {
    "code": "invalid_token",
    "message": "This link or code has expired or was already used. Ask for a new one.",
    "docsUrl": "https://flatstack.dev/docs/errors/invalid_token"
  }
}
```

[All error codes](/docs/errors)