## Start typing indicator

**post** `/v3/chats/{chatId}/typing`

Send a typing indicator to show that someone is typing in the chat.

## Behavior & Limitations

Typing indicators are best-effort signals with the following limitations:

- **Active conversations only:** The recipient must have sent or received a message
  in this chat within the **last 5 minutes**. If the chat is inactive, the request is
  still accepted (`204`) but the indicator will not reach the recipient's device.

- **No delivery guarantee:** Even for active chats, a `204` response only indicates
  the request was accepted for processing.

- **Group chats not supported:** Attempting to start a typing indicator in a group chat
  will return a `403` error.

### Path Parameters

- `chatId: string`

### Example

```http
curl https://api.linqapp.com/api/partner/v3/chats/$CHAT_ID/typing \
    -X POST \
    -H "Authorization: Bearer $LINQ_API_V3_API_KEY"
```

#### Response

```json
{
  "error": {
    "status": 400,
    "code": 1002,
    "message": "Phone number must be in E.164 format",
    "doc_url": "https://docs.linqapp.com/error/codes/1xxx/1002/"
  },
  "success": false
}
```