The type of the caption message.
The fallback text of the message.
The file as a JavaScript file type.
OptionallocaleThe language of the message, expressed as a locale string (e.g., "en-US"). If not set, the service attempts to detect the language from the message text, but only if automatic language detection is enabled. If auto-detection is disabled, the locale remains null, no language is set for the message, and the message isn't translated.
A list of quick replies. Optional.
The type of the message.
The caption text for the message.