# `POST /entity/{entityId}/address`

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

Create entity address

Creates an address for the entity. `addressType` is required.

## Path parameters

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

## Body (JSON)

```json
{
  "addressType": "billing",
  "street": "Hauptstraße",
  "streetNumber": "12",
  "zip": "10115",
  "city": "Berlin"
}
```

## Response `201`

Created address

```json
{
  "address": {
    "id": 1,
    "entityId": 1,
    "firstName": "…",
    "name": "…",
    "street": "…",
    "streetNumber": "…",
    "zip": "…",
    "city": "…",
    "county": "…",
    "addressType": "…"
  }
}
```

## Errors

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

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