# `PATCH /entity/{entityId}/contact/{id}`

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

Update entity contact

Patches `contactType` and/or `contact`.

## Path parameters

| Param | Required | Type | Description |
|-------|----------|------|-------------|
| `entityId` | yes | integer |  |
| `id` | yes | integer |  |

## Body (JSON)

| Field | Required | Type | Description |
|-------|----------|------|-------------|
| `contactType` | no | string |  |
| `contact` | no | string |  |

```json
{
  "contact": "anna.mueller@example.com"
}
```

## Response `200`

Updated contact

```json
{
  "contact": {
    "id": 1,
    "entityId": 1,
    "contactType": "…",
    "contact": "…"
  }
}
```

## Errors

| Status | Description |
|--------|-------------|
| 400 | Contact required, invalid ids, or no company selected — `{"error":"…"}` |
| 401 | Unauthorized — `{"error":"…"}` |
| 403 | Not authorized — `{"error":"…"}` |
| 404 | Contact, entity, or company not found — `{"error":"…"}` |

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