how to setup a greeting message when start conversation. about messenger-bot-tutorial HOT 3 OPEN

There is a separate API to do this.
Refer to, Thread Settings

from messenger-bot-tutorial.

Please help me more
because the tutorial uses commands and i didn't get the actual effect of the command.
For example when i run this command
curl -X POST -H "Content-Type: application/json" -d '{
"account_linking_url": "ACCOUN_LINKING_URL",
"persistent_menu": {
PERSISTENT_MENU_SETTINGS
},
"target_audience": {
TARGET_AUDIENCE_SETTINGS
}
}' "https://graph.facebook.com/v2.6/me/messenger_profile?access_token=PAGE_ACCESS_TOKEN"

i got this message
{"result":"success"}
but i didn't get the actual effect in my bot.
So please help me, I am a beginner at building bots :D

from messenger-bot-tutorial.

Please see the sample code written for NodeJS below,

import express from 'express';
var app = express();

app.post('/webhook', function (req, res) {
threadSettingsAPI();
}

function threadSettingsAPI(){
var messageData = {
"setting_type":"call_to_actions",
"thread_state":"new_thread",
"call_to_actions":[
{
"payload":JSON.stringify({
action:"GET_STARTED",
params:{}
})
}
]
};

request({
    url: 'https://graph.facebook.com/v2.8/me/thread_settings',
    qs: {access_token:process.env.PAGE_ACCESS_TOKEN},
    method: 'POST',
    json: messageData
}, function(error, response, body) {
    if (error) {
    } else if (response.body.error) {
        console.log('Error: ', response.body.error)
    }
})

}

from messenger-bot-tutorial.