# `POST /customergroup`

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

Create customer group

Creates a customer group for the selected company.
Appends with the next `sort` index. Reserved names `POS` and `Lieferanten`
are not allowed (`Name not allowed`).


## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `name` | yes | string |  |

```json
{
  "name": "Kunden"
}
```

## Response `201`

Created customer group

```json
{
  "customergroup": {
    "id": 1,
    "name": "…",
    "sort": 1
  }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Name required, name not allowed, or no company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Company not found — `{"error":"…"}` |

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