# Enum Interaction

Interaction

An enum type that specifies what to do in response to an interaction with a user, such as a user
clicking a button in a card message.

Only available for Google Chat apps. Not available for Google Workspace add-ons.

To call an enum, you call its parent class, name, and property. For example, `
CardService.Interaction.OPEN_DIALOG`.

### Properties

| Property | Type | Description |
|---|---|---|
| `INTERACTION_UNSPECIFIED` | `Enum` | Default value. The `action` executes as normal. |
| `OPEN_DIALOG` | `Enum` | Opens a dialog, a card-based interface that Chat apps use to interact with users. |