| Name | Type | Description | Notes |
|---|---|---|---|
| type | string | ||
| title | string | Label shown on the button. Facebook only. | |
| url | string | URL opened when the button is tapped. | |
| payload | string | Opaque value returned in the inbound webhook when the user taps the button. | |
| phone | string | E.164 phone number dialed when tapped. Facebook only. |