# `PUT /customergroup/order`

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

Reorder customer groups

Sets `sort` to each id’s index `0…n-1` in one transaction.
`customergroupIds` must be exactly the company’s groups (same set, no dups)
else `Invalid customer group order`.


## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `customergroupIds` | yes | integer[] |  |

```json
{
  "customergroupIds": [
    4,
    3,
    1,
    2
  ]
}
```

## Response `200`

New order

```json
{
  "customergroupIds": [
    1
  ]
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Invalid customer group order or no company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Company not found — `{"error":"…"}` |

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