Additional channel-specific properties.
Action type (e.g. "imBack", "postBack", "openUrl", "messageBack").
OptionaltitleDisplay text on the button.
OptionalvalueValue sent back to the bot when the action is invoked.
OptionaltextText to insert into the compose box when the action is invoked.
OptionaldisplayText shown in the chat feed when the action is invoked (may differ from text).
OptionalimageURL to an icon image displayed on the button.
A quick-reply button or action displayed to the user.
Card actions represent clickable options in clients that support suggested actions or hero/thumbnail cards.