# `POST /order/{id}/shipping`

Protected. Requires a valid session cookie (`credentials: 'include'`).

Create shipping for an order

Creates a shipping for the order. The shipping number is allocated from the
`shipping` number sequence (prefix and counter from the numbers API).
If `state` is `shipped`, stock is adjusted via the ledger and article history is written.


## Path parameters

| Param | Required | Type | Description |
|-------|----------|------|-------------|
| `id` | yes | integer | Order ID |

## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `carrierId` | yes | integer | Carrier ID |
| `type` | yes | string |  |
| `state` | yes | string |  |
| `trackingCode` | no | string | Carrier parcel tracking code |
| `warehouseId` | no | integer | Optional warehouse ID for stock deduction when state is shipped |

```json
{
  "carrierId": 1,
  "type": "…",
  "state": "…",
  "trackingCode": "…",
  "warehouseId": 1
}
```

## Response `201`

Created shipping

```json
{
  "shipping": {
    "id": 1,
    "manifestId": 1,
    "number": "…",
    "trackingCode": "…",
    "carrierId": 1,
    "carrier": "…",
    "type": "…",
    "state": "…"
  }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Validation error or no company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Order or warehouse not found — `{"error":"…"}` |
| 409 | Order already shipped — `{"error":"…"}` |

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