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{ "messages": [ { "attachment": { "type": "template", "payload": { "template_type": "button", "text": "Hello!", "buttons": [ { "type": "show_block", "block_names": ["name of block"], "title": "Show Block" }, { "type": "web_url", "url": "https://rockets.chatfuel.com", "title": "Visit Website" }, { "url": "https://rockets.chatfuel.com/api/welcome", "type":"json_plugin_url", "title":"Postback" } ] } } } ] }