{ "messages": [ { "attachment": { "type": "template", "payload": { "template_type": "button", "text": "Don't spend 2 dollars to dry-clean a shirt. Donate it to the Salvation Army instead. They'll clean it, put it on a hanger. Next morning buy it back for 50p.", "buttons": [ { "type": "show_block", "block_names": ["Joke"], "title": "Tell me another joke" } ] } } } ] }