A merge field for an audience.
| Name | Type | Description | Notes |
|---|---|---|---|
| Id | int32 | An unchanging id for the merge field. | [optional] [readonly] |
| Label | string | The label for the merge field. | [optional] [readonly] |
| Type | string | The type for the merge field. for more information please, see Model/string.php | [optional] [readonly] |