Optional header shown above the body.
| Name | Type | Description | Notes |
|---|---|---|---|
| Type | string | [optional] | |
| Text | string | Required when header type is text. | [optional] |
| Image | SendInboxMessageRequestInteractiveHeaderImage | [optional] | |
| Video | SendInboxMessageRequestInteractiveHeaderImage | [optional] | |
| Document | SendInboxMessageRequestInteractiveHeaderImage | [optional] |