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

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

Create package for a shipment

Creates a physical package (shipping) for the shipment manifest.
Accepts carrier and parcel tracking code. If state is `shipped`,
deducts stock for the shipment's lines via ledger movements.


## Path parameters

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

## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `type` | yes | string |  |
| `state` | yes | string |  |
| `trackingCode` | no | string | Carrier parcel tracking code |
| `carrier` | no | string | Carrier name (e.g. DHL, UPS, DPD) |
| `warehouseId` | no | integer | Optional warehouse ID for stock deduction when state is shipped |

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

## Response `201`

Created package

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

## Errors

| Status | Description |
|--------|-------------|
| 400 | Validation error, manifest is not a shipment, or no company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 404 | Shipment or warehouse not found — `{"error":"…"}` |

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