| Name | Type | Description | Notes |
|---|---|---|---|
| messageId | String | ||
| userId | String | ||
| channelType | Integer | Supports `1` and `3`. | |
| channelId | String | ||
| metadata | Map<String, String> | Message metadata to set. Keys support letters, digits, and `+ = - _`, with a maximum key length of 32 characters. Each request can set up to 100 entries. | |
| isEchoToSender | Integer | [optional] |