# Poll for the device authorization result

`POST /v1/public/device/token`

URL: https://docs.spacerun.co/docs/platform/reference/device-authorization/exchangeDeviceCode

- **Operation ID:** `exchangeDeviceCode`
- **Tags:** Device authorization
- **Base URL:** `http://localhost:8787`

Poll with `grant_type=urn:ietf:params:oauth:grant-type:device_code` and the `device_code`. Wait at least `interval` seconds between polls (starts at 5). Polling faster returns 400 `slow_down` with a widened `interval` (+5s each time, max 60s). Other 400 errors: `authorization_pending` (user has not responded yet; keep polling at the returned `interval`), `expired_token` (stop and restart), `access_denied` (user denied or revoked), `invalid_grant` (unknown, already consumed or not yet claimable code), `unsupported_grant_type`, `invalid_request` (malformed body). On success the response is single use: pass `token_hash` to GoTrue to obtain a session. A per-IP guard of 30 polls per minute also answers 400 `slow_down`. 500 `server_error` means token issuance failed; the code is not consumed, so retry.

**Workflow:** [Integration guide](https://docs.spacerun.co/docs/platform/guides/device-authorization).

**Authentication:** none (public).

## Authentication

- **Auth:** none (public endpoint, no token required).

## Request body

Required: yes.

Content type: `application/json`

Schema: `object`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `grant_type` | `string` | yes | - |
| `device_code` | `string` | yes | Min length: 1 |

## Responses

### 200

Approved; one-time login token.

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object (DeviceTokenResponse)`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `token_hash` | `string` | yes | GoTrue magic-link hashed token; exchange it with GoTrue `verifyOtp` (`type: magiclink`). |
| `type` | `string` | yes | One of: `"magiclink"` |
| `expires_in` | `integer` | yes | Seconds the token_hash stays valid (60). |

## Errors

### 400

OAuth-style error (see description).

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object (DeviceOAuthError)`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `error` | `string` | yes | RFC 8628 style error string.. One of: `"invalid_request"`, `"unsupported_grant_type"`, `"authorization_pending"`, `"slow_down"`, `"expired_token"`, `"access_denied"`, `"invalid_grant"`, `"server_error"` |
| `interval` | `integer` | no | Current polling interval in seconds; set for `authorization_pending` and `slow_down`. |

**Example**

```json
{
  "error": "authorization_pending",
  "interval": 5
}
```

### 500

Token issuance failed (`server_error`).

- Header `x-request-id`: Request identifier; quote it when reporting an error.
Content type: `application/json`

Schema: `object (DeviceOAuthError)`, fields as described above.

### 503

 Maintenance can refuse this write before authentication (degraded blocks session start and checkout; lockdown blocks other public/user writes).

- Header `x-request-id`: Request identifier; quote it when reporting an error.
- Header `Retry-After`: Maintenance retry delay in seconds; present for panic_mode. Example: `30`.
Content type: `application/json`

Schema: `object (MaintenanceErrorBody)`

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `error` | `string` | yes | One of: `"panic_mode"` |
| `level` | `string` | yes | One of: `"degraded"`, `"lockdown"` |
| `reason` | `string \| null` | yes | - |

**Maintenance lockdown**

```json
{
  "error": "panic_mode",
  "level": "lockdown",
  "reason": "Scheduled maintenance"
}
```

## Examples

### curl

```bash
curl -X POST 'http://localhost:8787/v1/public/device/token' \
  -H 'Content-Type: application/json' \
  --data '{"grant_type":"example","device_code":"example"}'
```

### TypeScript

```ts
const response = await fetch("http://localhost:8787/v1/public/device/token", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "grant_type": "example",
    "device_code": "example"
  }),
});
if (!response.ok) throw new Error(`HTTP ${response.status}: ${await response.text()}`);
const data = response.status === 204 || response.status === 205
  ? undefined
  : response.headers.get("content-type")?.includes("json")
    ? await response.json()
    : await response.text();
```