It's an late update but will save someone usefull time. With help of below code you can show multiple buttons on facebook chatbot. Technology used for development is node js,botbuilder,luis.
var msg = new builder.Message(session);
msg.sourceEvent({
"facebook": {
"attachment": {
"type": "template",
"payload": {
"template_type": "button",
"text": "You can either hit 'FAQ' to get the help, or head to the Mannual Help for getting help.",
"buttons": [
{
"type": "web_url",
"url": 'https://stackoverflow.com/',
"title": "Mannual Help"
},
{
"type": "postback",
"title": "FAQ",
"payload": "FAQ_SELECTED_BY_USER"
}]
}
}
}
});
session.send(msg);
