# `GET /customergroup`

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

List customer groups

Lists customer groups for the selected company, ordered by `sort`.
Each item includes `editable`: `false` for implicit `POS` / `Lieferanten`
(name locked), `true` otherwise. Reorder via `PUT /customergroup/order`.


## Response `200`

Customer group list

```json
{
  "customergroups": [
    {
      "id": 1,
      "name": "…",
      "sort": 1,
      "editable": true
    }
  ]
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | No company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Company not found — `{"error":"…"}` |

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