OptionalactionsOptionalblockWhen set to true, the chat input will be disabled on supported client implementations when the message is the most recent one in the history. Can be used for guided flows or to temporarily disable the user's ability to send messages in the conversation.
OptionalhtmlOptionalpayloadThe payload of a reply button response message.
OptionaltextThe text content of the message. Required unless actions, htmlText or markdownText is provided.
The type of message.
Array of message actions.